Q My son has a 2007 Audi A4 2.0 TDI (140) S line saloon with engine code BRE, which he has had since 2014. I have serviced it annually and it has served him well. The last time I serviced it I noticed evidence of oil in the coolant expansion bottle (dirty black inside) which I tried
Oil in coolant
Apr 19, 2024
2 minutes
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