Coolant spec Opel Astra J (2009–2015) — type, volume, change interval
Which coolant to use in Opel Astra J (2009–2015) — type, colour, system volume and replacement interval.
Cooling System Specifications
| Parameter | Value |
|---|---|
| Make / Model | Opel Astra J |
| Production Years | 2009–2015 |
| Coolant type | OAT Dex-Cool |
| Colour | orange |
| System volume | 7.0 L |
| Mix ratio | 50/50 (concentrate / water) |
| OEM approval | GM 6277M |
| Replacement interval | every 5 years |
Coolant replacement is time-based, not mileage-based. Corrosion inhibitors degrade over time regardless of how far you drive.
Approved Coolant Brands
Prestone AF2100 / Febi OAT orange / Liqui Moly KFS OAT
Mixing Rules
- Do not mix different coolant types (G11/G12/G13) — mixing causes a chemical reaction and sludge formation.
- When topping up, use the same type: OAT Dex-Cool.
- Always dilute concentrate with distilled water at a ratio of 50/50.
- Freeze protection at 50/50 mix: approximately –37°C.
Checking Coolant Level and Condition
- Check the level in the expansion tank on a cold engine — it should be between MIN and MAX marks.
- Fresh OAT Dex-Cool coolant is orange. Brown, cloudy or sediment-filled coolant must be replaced immediately.
- Hydrometer test: density at 50/50 mix should be 1.060–1.080 g/cm³.
FAQ
Which coolant should I use in Opel Astra J?
Type OAT Dex-Cool (orange), approval GM 6277M. Compatible brands: Prestone AF2100 / Febi OAT orange / Liqui Moly KFS OAT.
How much coolant does a Opel Astra J hold?
The total cooling system volume is 7.0 L. A partial change will require less — calculate based on the volume drained.
How often should coolant be replaced in Opel Astra J?
Every 5 years, regardless of mileage. Do not delay — depleted coolant causes corrosion of aluminium engine components.
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