| Assessment of wear by checking ATF for colour and contamination |
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| Colour yellow: ATF is new. |
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| Colour brown: ATF is used (approx. 60,000 km upwards) |
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| Colour black, ATF smells burnt: one or more gearbox components defective (e.g. overheating of torque converter clutch, burnt out clutch linings). |
Note | On vehicles with TDI engines, the ATF turns black after approx. 60,000 km without the gearbox being defective. |
| ATF contains metal particles |
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| Degree of wear is normal if metal particles on magnet in ATF oil pan or in ATF are not larger than 0.1 mm in diameter and quantity of particles does not exceed 1 cm3. |
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| Wear exceeds normal range or there is a mechanical fault if metal particles on magnet in ATF oil pan or in ATF are larger than 2.0 mm in Ø. |
| Procedure if ATF is contaminated |
| ATF very contaminated (ATF black or metal particles in ATF → Anchor): |
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| Dismantle and clean complete gearbox. |
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| Flush ATF galleries and blow through with compressed air. |
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| Dismantle and check all clutches. |
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| Renew torque converter (cannot be cleaned). |
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| Renew valve body (cannot be cleaned). |
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| Clean ATF pipes and ATF cooler. |
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