ADVERTISEMENT
Sort

Filter & Refine

Dealer used
4 cyl
Fixed Price
Offering
Front Wheel Drive
View Layout

HOLDEN ASTRA Used Car Review

Pros

Cons

  • Competent ride and handling. Fast and fun VXR hot-hatch.
  • Good turbo petrol engines
  • Sedan's spacious cabin; hatch's practical boot
  • BK generation (late 2016) brought more upmarket cabin
  • Latest sedan misses some of hatch's safety tech
  • Lack of rear vents on some models
  • AH Astra (2004-2010) not as satisfying to drive as predecessor or successors
This is general information and should not be relied on as purchasing advice.
HoldenAstraFixed PriceFront Wheel Drive4 cylDealer usedClear all

Top2017 Holden Astra BK MY17 R Red 6 Speed Automatic Hatchback

  • 68268 km
  • Hatchback
  • Auto
  • 4 cyl 1.4L

2017 Holden Astra R 1.4L Turbo 6 Sp Automatic * Very low kilometres * One owner with complete service history * Apple CarPlay and Android auto * Automatic headlights * Bluetooth * USB audio input * Reverse sensors * Reverse camera * Multifunction steering wheel * Climate control * Automatic * 5 star ANCAP safety rating * Extremely economical * Cruise control * Immaculate condition Brighton Prestige - Shop with confidence - Family owned for 30 years - We deliver Australia wide - Finance optio

$15,990 Excl. Gov. Charges
Bentleigh, VIC

Dealer used
Yesterday

Top2017 Holden Astra BK MY17 RS-V 6 Speed Sports Automatic Hatchback

  • 86432 km
  • Hatchback
  • Auto
  • 4 cyl 1.6L

Welcome to our dealership, where the perfect car is just a phone call away! At our dealership conveniently located near the CBD, we're revolutionizing the way you buy vehicles. With our focus on providing exceptional service and competitive pricing, we're dedicated to ensuring your car-buying experience is seamless and satisfying. Our call center isn't just a point of contact; it's your gateway to a vast selection of top-quality vehicles. From small vehicles to luxury SUVs and everything in

$17,568 Excl. Gov. Charges
Victoria Park, WA

Dealer used
8 hours ago

Top2004 Holden Astra TS MY04.5 Classic Blue 4 Speed Automatic Hatchback

  • 91340 km
  • Hatchback
  • Auto
  • 4 cyl 1.8L

Looking for a reliable and stylish hatchback? Look no further than this 2004 Holden Astra Classic! With only 91,340 km on the odometer, this blue beauty is ready for its next adventure. Equipped with 6 speaker stereo, climate control, CD player, and remote central locking, this Astra Classic has everything you need for a comfortable and convenient drive. Its adjustable steering column, electric power steering, and independent front suspension ensure a smooth and enjoyable ride every time. Saf

$7,995 Excl. Gov. Charges
Minchinbury, NSW

Dealer used
08/05/2024

Top2017 Holden Astra BL MY17 LS+ White 6 Speed Sports Automatic Sedan

  • 18500 km
  • Sedan
  • Auto
  • 4 cyl 1.4L

Are you searching for a sleek and stylish sedan that offers both performance and comfort? Look no further than this 2017 Holden Astra LS+ in pristine white. With only 18,500 km on the odometer, this vehicle is practically brand new. Priced at $18,990.00 AUD, this Astra is equipped with a range of features that will make every drive a pleasure. From the 16" alloy wheels to the 6 speaker stereo system, this car has everything you need for a smooth and enjoyable ride. Safety features such as ABS

$17,990 Excl. Gov. Charges
Five Dock, NSW

Dealer used
08/05/2024

Top2007 Holden Astra AH MY08 Twin TOP Blue 4 Speed Automatic Convertible

  • 109401 km
  • Convertible
  • Auto
  • 4 cyl 2.2L

**2007 HOLDEN ASTRA CONVERTIBLE COUPE TWIN TOP AH 2.2L PETROL 4 SPEED AUTOMATIC ONLY $9,990 Or Finance From Only $50 P/w ** This Sporty Vehicle Is Absolutely Immaculate! This is Sensational Value! ** Looks Amazing In This Colour ! ** Only Done A Very Low 109,401K's ! ** Super Low Mileage ! ** Economical But Powerful 2.2L Petrol Engine With a Sporty Automatic Transmission, This luxurious car really stands out!! **Don't miss out on this one! Credit to the previous owner**Comes with Log Books

$9,990 Excl. Gov. Charges
Osborne Park, WA

Dealer used
7 hours ago

Top2019 Holden Astra BK MY20 RS-V White 6 Speed Sports Automatic Hatchback

  • 46017 km
  • Hatchback
  • Auto
  • 4 cyl 1.6L

ZIPPY and STYLISH, combine it with all-round versatility and practicality.. 1.6L TURBOCHARGED engine with 147kW.. AUTOMATIC.. FULLY FEATURED.. Including forward collision warning, lane departure warning, blind spot monitoring, keyless go, heated leather, APPLE CARPLAY and ANDROID AUTO, reverse camera, and so much more.. Presents in excellent condition and is ready to go to its next owner.. Call us to book a test drive TODAY! Choose from over 200 vehicles in our stock - with a vast range of s

$21,999 Excl. Gov. Charges
Myaree, WA

Dealer used
08/05/2024

2008 Holden Astra AH MY08 CDX White 4 Speed Automatic Wagon

  • 95278 km
  • Wagon
  • Auto
  • 4 cyl 1.8L

POPULAR ASTRA CDX AUTOMATIC WAGON ONE OWNER FULL HISTORY AND VERY LOW KMS LEATHER TRIM ALLOYS AND LONG REGO DONT MISS OUT CALL MIKE NOW FINANCE ON SITE OR BY PHONE Welcome to Mike's Motors we have been selling cars in the local area for over 20 years and have been in the used car industry for over 30 years. We do our very best to offer quality pre owned cars at fair prices. All of our vehicles are workshopped and come with a current roadworthy certificate and a clear PPSR report. We

$8,995 Excl. Gov. Charges
Mount Druitt, NSW

Dealer used
11 minutes ago

2018 Holden Astra BK MY18 LS+ Sportwagon White 6 Speed Sports Automatic Wagon

  • 53024 km
  • Wagon
  • Auto
  • 4 cyl 1.4L

We are located just 30 minutes west of Sydney airport conveniently just minutes off the M 5 motorway. Located on 7.5 acres. We are open 7 days from 8.30 am to 5.30 pm. Open Sunday 10.00 am to 4.30 pm. Our aim is to keep our cars the cheapest by comparison without compromising quality. We specialise in quality used cars from a large range of manufacturers, allowing us to offer our clients a huge variety. Each one of our used car sales team members have been with the company for over 18 years, h

$16,990 Excl. Gov. Charges
Condell Park, NSW

Dealer used
2 hours ago

2018 Holden Astra BL LT White 6 Speed Sports Automatic Sedan

  • 74554 km
  • Sedan
  • Auto
  • 4 cyl 1.4L

******H0LDEN ASTRA SEDAN******* * Auto * LTZ Model * Alloys * Cruise * Electrics * Air Con * Sat Nav * Reverse Camera * Power Steering * Electrics * Central Locks * Plus More * Very Nice Car! 1. All our cars are mechanically checked by an independent mechanic before we put them up for sale. 2. Our cars can be viewed under cover and be taken for a test drive before you buy, unlike an auction. 3. Our cars come with a Roadworthy Certificate from an independent mechanic. 4. We accept trade ins

$15,999 Excl. Gov. Charges
Ringwood, VIC

Dealer used
3 hours ago

2006 HOLDEN Astra CD

  • 160000 km
  • Hatchback
  • Manual
  • 4 cyl 1.8L

● 2006 Holden Astra CD Hatchback ● 1.8L 4cyl Manual 5spd ● Service history & books Looks & drives great, good cheap runabout! • Power windows • Power mirrors • Remote central locking • Ice cold Air-conditioning 🧊 • Alloy wheels • Tinted windows • Multi-function steering wheel • Trip computer • 1.8L 4cyl • 5spd Manual $3999 located in Lonsdale viewing by appointment only Trade in's welcome, we can TRADE your OLD CAR in! 🚗 Finance & warrenty available! MVD273544

$3,999 Excl. Gov. Charges
Lonsdale, SA

Dealer used
3 hours ago

2015 Holden Astra PJ MY15.5 GTC Sport White 6 Speed Manual Hatchback

  • 56837 km
  • Hatchback
  • Manual
  • 4 cyl 1.6L

Beautifully presented sports coupe with only 57,000kms, full service history, powerful 1.6 litre turbo engine, sporty six speed floor shift, SatNav, luxurious sports style leather seating, cruise and traction control, front side airbags, Bluetooth connectivity, heated front seating, alloy wheels, rear spoiler, front and rear sensors plus more. Absolutely stunning.

$18,999 Excl. Gov. Charges
Welshpool, WA

Dealer used
4 hours ago

2018 Holden Astra BK MY18.5 RS Silver 6 Speed Sports Automatic Hatchback

  • 96026 km
  • Hatchback
  • Auto
  • 4 cyl 1.6L

We are a family owned and run Dealership located in Northern Tasmania. With trade-ins, extended warranties, finance and insurance available, we can assist you with the purchase of your next vehicle. We advertise our cars at market competitive fixed-prices, removing the need for back and forward haggling. Please note we encourage local Tasmanian buyers who can inspect and test drive vehicles they might be interested in before purchase – to ensure satisfaction. Freight from Tasmania to the main

$13,990 Excl. Gov. Charges
Launceston, TAS

Dealer used
4 hours ago

2007 Holden Astra AH MY07 CDX Silver, Chrome 5 Speed Manual Hatchback

  • 218086 km
  • Hatchback
  • Manual
  • 4 cyl 1.8L

WHAT WE OFFER: ?Finance with low low rates ? ? Trade ins welcome ? ? Pre-purchase inspection with your mechanic of choice! ??? ? SAFETY CERTIFICATE! RWC! ? ? PROFESSIONAL DETAILING ON VEHICLE BEFORE PURCHASING ? ?EXTENDED WARRANTY AVAILABLE UPTO 5 YEARS! UNLIMITED KILOMETERS AND AUSTRALIA WIDE! ? Car has gone through our workshop and has passed our mechanical inspection. Looking for that peace of mind? Our Extended Warranty provided at the time of sale is Australia Wide, which means you w

$4,840 Excl. Gov. Charges
Coorparoo, QLD

Dealer used
5 hours ago

2017 Holden Astra BK MY18 R Silver 6 Speed Sports Automatic Hatchback

  • 92556 km
  • Hatchback
  • Auto
  • 4 cyl 1.4L

With service history and very popular 2017 Holden Astra R in Silver - 1.4T petrol engine - Automatic transmission - 5 doors hatch - Apple car play / Android Auto - Alloy wheels - Bluetooth - Cruise control - Multi function steering wheel - Reverse camera - Air conditioning - USB - Automatic headlights - Tow keys - Trade ins welcome - Finance options available - Great range of warranties available MD28651 We offer easy and affordable finance options to suit any customer. Located at JL Motors P

$14,970 Excl. Gov. Charges
Victoria Park, WA

Dealer used
5 hours ago

2017 Holden Astra BK MY17 R White 6 Speed Sports Automatic Hatchback

  • 129960 km
  • Hatchback
  • Auto
  • 4 cyl 1.4L

SHARPLY PRICED AND AN ABSOLUTE RIPPER Looking for a reliable and stylish ride? Look no further than this 2017 Holden Astra R Hatchback in sleek white. With a turbocharged engine and sporty design, this Astra is sure to turn heads on the road. Packed with features like alloy wheels, rear vision camera, Bluetooth connectivity, and LED daytime running lamps, this hatchback offers both convenience and safety. The spacious interior with adjustable seats and plenty of storage options make every dri

$13,999 Excl. Gov. Charges
Ringwood, VIC

Dealer used
6 hours ago

2015 Holden Astra PJ VXR Red 6 Speed Manual Hatchback

  • 155421 km
  • Hatchback
  • Manual
  • 4 cyl 2.0L

Welcome to Cars Connect, Check out our NEW website www.carsconnect.com.au fresh WHOLESALE cars daily!!!!! BUYING OR SELLING ?? Welcome to CARS CONNECT , wholesalers in the motor industry. We pride our selves in helping people SELL or PURCHASE their next new or pre-loved motor vehicle. Our wholesale stock range consists mainly of freshly TRADED vehicles DIRECT from our local franchise dealer network , the vehicles we have advertised direct to public are hand picked and priced to move quick

$15,990 Excl. Gov. Charges
Edgeworth, NSW

Dealer used
6 hours ago

2009 HOLDEN Astra CD, 60th Anniversary, auto, low kilometers, $ 6600, great 1st car.

  • 135747 km
  • Hatchback
  • Auto
  • 4 cyl 1.8L

2009 HOLDEN Astra CD, 60th Anniversary Just been traded in. auto, clean and tidy, low kilometers, good tyres all around, starts and drives very well, good on fuel, great 1st car. $ 6600 Pls call Eric for more details. A true pleasure to drive under all circumstances, with a powerful yet fuel efficient engine, this car has been built to provide optimum levels of performance and handling. All our pre-owned vehicles come with a full mechanical inspection and therefore we can offer

$6,600 Excl. Gov. Charges
Wollongong, NSW

Dealer used
6 hours ago

2007 HOLDEN ASTRA CD AUTOMATIC HATCHBACK 4CYL 1.8L 134,000 Kms

  • 134000 km
  • Hatchback
  • Auto
  • 4 cyl 1.8L

✔️RWC ✔️REGO ✔️WARRANTY ✔️FINANCE ✔️TRADE INS 2007 HOLDEN ASTRA CD AUTOMATIC HATCHBACK 4CYL 1.8L 134,000 Kms 🏁 BLUETOOTH CONNECTION TO LISTEN TO YOUR FAVORITE MUSIC 🏁 DRIVES VERY NICE & SMOOTH 🏁 RWC & REGISTRATION 🏁 FREEZING AIRCON 🏁 CRUISE CONTROL 🏁 ODO: 134,000KMs 🏁 PETROL ENGINE 🏁 WARRANTY 🏁 AUTOMATIC 🏁 5 SEATER 🏁 5 DOORS 🏁4 CYL 🏁 RWC 🏁 1.8L 🏁🏁 THE CAR COMES WITH ROADWORTHY CERTIFICATE & REGISTRATION (exc. Gov. Charges) 🏁🏁 THE CAR COMES WITH DEALER WARRANTY 🏁🏁 FINA

$7,995 Excl. Gov. Charges
Acacia Ridge, QLD

Dealer used
6 hours ago

2008 Holden Astra AH MY08 CD White 4 Speed Automatic Wagon

  • 171616 km
  • Wagon
  • Auto
  • 4 cyl 1.8L

2008 Holden Astra AH MY08 CD White 4 Speed Automatic Wagon

$4,490 Excl. Gov. Charges
South Nowra, NSW

Dealer used
6 hours ago

2007 Holden Astra AH MY08 Twin TOP Blue 4 Speed Automatic Convertible

  • 109401 km
  • Convertible
  • Auto
  • 4 cyl 2.2L

**2007 HOLDEN ASTRA CONVERTIBLE COUPE TWIN TOP AH 2.2L PETROL 4 SPEED AUTOMATIC ONLY $9,990 Or Finance From Only $50 P/w ** This Sporty Vehicle Is Absolutely Immaculate! This is Sensational Value! ** Looks Amazing In This Colour ! ** Only Done A Very Low 109,401K's ! ** Super Low Mileage ! ** Economical But Powerful 2.2L Petrol Engine With a Sporty Automatic Transmission, This luxurious car really stands out!! **Don't miss out on this one! Credit to the previous owner**Comes with Log Books

$9,990 Excl. Gov. Charges
Osborne Park, WA

Dealer used
7 hours ago

2017 Holden Astra BK MY17 RS-V 6 Speed Sports Automatic Hatchback

  • 86432 km
  • Hatchback
  • Auto
  • 4 cyl 1.6L

Welcome to our dealership, where the perfect car is just a phone call away! At our dealership conveniently located near the CBD, we're revolutionizing the way you buy vehicles. With our focus on providing exceptional service and competitive pricing, we're dedicated to ensuring your car-buying experience is seamless and satisfying. Our call center isn't just a point of contact; it's your gateway to a vast selection of top-quality vehicles. From small vehicles to luxury SUVs and everything in

$17,568 Excl. Gov. Charges
Victoria Park, WA

Dealer used
8 hours ago

2018 Holden Astra 5L MY18 LS Plus (5Yr) Silver, Chrome 6 Speed Automatic Sedan

  • 28002 km
  • Sedan
  • Auto
  • 4 cyl 1.4L

Looking for a sleek and reliable sedan that won't break the bank? Look no further than this 2018 Holden Astra LS Plus! Priced at $18,990.00 AUD, this beauty comes with a full logbook and spare key - so you know it's been well taken care of. With only 28,002 km on the odometer, this Astra drives excellent and is ready to hit the road. Featuring a turbo 1.4L engine and a 6-speed automatic transmission, this Astra is not only powerful but also fuel-efficient. Plus, with features like Apple Car Pl

$18,990 Excl. Gov. Charges
Seven Hills, NSW

Dealer used
8 hours ago

2017 Holden Astra BL LTZ Grey Steptronic Sedan

  • 8455 km
  • Sedan
  • Auto
  • 4 cyl 1.4L

***WESTERN AUSTRALIAS LARGEST FRANCHISE USED CAR OPERATION*** 2017 LTZ ASTRA AUTO WITH FRONT AND REAR SENSORS, FLOOR MATS, DASH MAT,DASH CAM, REVERSE CAMERA, BLUETOOTH, LEATHER SEATS, SUNROOF AND SO MUCHMORE

$22,789 Excl. Gov. Charges
Cannington, WA

Dealer used
9 hours ago

2000 Holden Astra CD

  • 102985 km
  • Sedan
  • Manual
  • 4 cyl 1.8L

LOW KILOMETRES, ECONOMICAL 1.8 LITRE ENGINE, 5 SPEED MANUAL TRANSMISSION, POWER WINDOWS, ALLOY WHEELS AND MUCH MORE... This vehicle is located at Sky Motors, 347 Main North Road, Enfield, SA 5085. We are one of the biggest and best, quality second hand vehicle used car dealerships in Adelaide and South Australia. Our friendly team ensures we always have the lowest prices and best used car deals in Adelaide and South Australia. 1-5 Year EXTENDED WARRANTY and 24 hour Road side Assistance Avail

$5,490 Excl. Gov. Charges
Enfield, SA

Dealer used
10 hours ago

2017 Holden Astra BK MY17 RS White 6 Speed Sports Automatic Hatchback

  • 50839 km
  • Hatchback
  • Auto
  • 4 cyl 1.6L

PERTH THIS ONE OWNER HOLDEN ASTRA RS 5 DOOR HATCH HAS VERY LOW KM'S WITH COMPLETE SERVICE HISTORY, 1.6 LITRE TURBO PERFORMANCE, AUTOMATIC TRANSMISSION, AIR CONDITIONING, CRUISE CONTROL, BLUETOOTH CONNECTIVITY, REVERSING CAMERA AND ALLOY WHEELS. HAS JUST SERVICED BY US AND IS READY FOR AN IMMEDIATE DELIVERY. ALL TRADE IN'S ARE WELCOME WITH US, WE HAVE AN ON SITE BROKER TO HELP WITH YOUR CAR FINANCE NEEDS IF REQUIRED AND THE OPTION OF 1 TO 5 YEAR WARRANTIES ARE ALSO AVAILABLE. We are a Multi fra

$16,965 Excl. Gov. Charges
Attadale, WA

Dealer used
10 hours ago

2017 Holden Astra BK MY17 R Grey 6 Speed Sports Automatic Hatchback

  • 83466 km
  • Hatchback
  • Auto
  • 4 cyl 1.4L

Unable to make it to the Dealership? We’ve got you covered: • Request a video call or walkaround demonstration. • Safety Checks completed on site to ensure the vehicle is safe and ready for the road. • Personal Property Securities Register (PPSR) Check completed. • 3 month/5,000 km statutory warranty provided. • Competitive Finance and Insurance packages available with over the phone approvals. • Ask us for a quote to truck the vehicle to your location - Australia Wide. This ve

Contact Dealer for Price
Brookvale, NSW

Dealer used
10 hours ago

2005 Holden Astra AH CD Silver 5 Speed Manual Hatchback

  • 229063 km
  • Hatchback
  • Manual
  • 4 cyl 1.8L

PERTH, WESTERN AUSTRALIAN WHOLESALE OUTLET. 6102. TRADE-INS WELCOME. WARRANTY OPTIONS AVAILABLE TO ENQUIRE ON THIS VEHICLE CALL FOR FINANCE OPTIONS CONTACT AARON ON CLICK HERE TO REGIESTER YOUR FINANCE ENQUIRY used cars, cheap cars, automatic, manual, fuel efficient, cheap, reliable, private, dealer, ute, sedan, hatch, diesel, petrol, small, service history,

$3,985 Excl. Gov. Charges
Victoria Park, WA

Dealer used
10 hours ago

2016 Holden Astra BK MY17 R Blue 6 Speed Manual Hatchback

  • 67849 km
  • Hatchback
  • Manual
  • 4 cyl 1.4L

2016 Holden Astra BK MY17 R Hatchback 5dr Man 6sp 1.4T Unbeatable value | Haggle Free - Fixed Pricing! (No offers please) Our dedicated and highly experienced team of Business Managers can assist you with flexible car finance options, and competitive insurance. Just arrived and ready for its new owner is this stunning 2016 Holden Astra MY17 R Hatchback Finished in Blue over Black interior this vehicle is well equipped for its next adventure with the following inclusions: - Cruise Control -

$13,786 Excl. Gov. Charges
Parramatta, NSW

Dealer used
10 hours ago

2019 Holden Astra BK MY20 R White 6 Speed Sports Automatic Hatchback

  • 76941 km
  • Hatchback
  • Auto
  • 4 cyl 1.4L

2019 Holden Astra BK MY20 R Hatchback 5dr Spts Auto 6sp 1.4T We are a family owned and operated multi-franchise dealership, with a genuine passion for used cars where they are the focus not just an after thought. We only keep the best trade ins, vehicles that have been serviced, maintained and looked after since new. This vehicle passed our strict 100 point safety inspection and was prepared for the yard to our high standards With over 45,000 used cars sold over 40 years, nobody knows the diff

$17,990 Excl. Gov. Charges
Nuriootpa, SA

Dealer used
10 hours ago

2007 Holden Astra CD

  • 125966 km
  • Hatchback
  • Auto
  • 4 cyl 1.8L

LOW KILOMETRES, ECONOMICAL 1.8 LITRE ENGINE, SMOOTH 4 SPEED AUTO, ALLOY WHEELS AND MUCH MORE... This vehicle is located at Sky Motors, 347 Main North Road, Enfield, SA 5085. We are one of the biggest and best, quality second hand vehicle used car dealerships in Adelaide and South Australia. Our friendly team ensures we always have the lowest prices and best used car deals in Adelaide and South Australia. 1-5 Year EXTENDED WARRANTY and 24 hour Road side Assistance Available. Fast Easy Finan

$8,990 Excl. Gov. Charges
Enfield, SA

Dealer used
11 hours ago

Overview of the Holden Astra

Overview of the Holden Astra

HOLDEN ASTRA GENERATIONS (SINCE 1998)

1998-2005

2004-2010

2012-2013 (Opel)

2015-2016

2016-present

RUNNING COSTS

Fuel Consumption

1.4L 4-cylinder turbo petrol: 5.8 to 6.1 litres per 100km

1.6L 4-cylinder turbo petrol: 6.3 to 6.5 litres per 100km

1.6L 4-cylinder turbo petrol (2016 GTC): 6.9 to 7.5 litres per 100km

2.0 L 4-cylinder turbo petrol (2016 VXR): 8.0 litres per 100km

= Highly economical.

= Good economy.

= Average fuel use.

= Heavy consumption.

Servicing

Lifetime capped price servicing program. Every 15,000km or 9 months, whichever is sooner. Each service currently costs between $229 and $1131 (depending on age or kilometres of vehicle). Holden Astra parts and equipment can be found on Gumtree.

SIMILAR MODELS TO HOLDEN ASTRA

WHAT TO LOOK OUT FOR: HOLDEN ASTRA (2004-2010)

Dodgy electricals are a real Astra biggie. So check the operation of everything from the air-conditioning to the hazard flashers.

Both the 1.8-litre and turbo-diesel engines needed new timing belts every 60,000km. The water pump and pulleys should also have been changed at the same time. Many owners didn't bother. Water pumps can fail and lead to overheating.

The diesel engine can develop a build-up of soot in the intake manifold, blocking the swirl valves and leading to poor fuel economy and performance. In some cases the whole manifold needed replacement.

Automatic transmissions use an external cooler that can fail, allowing coolant into the gearbox. Any milkiness in the transmission fluid suggests this is the case but damage will already be done.

Astras can also leak oil and this is often the precursor to the engine starting a downward condition spiral. Work out where the car is parked overnight and check for oil spots.