Hi , new member Andy .

Ive had my 2011 s3 for 10 months and have had milky residue on my oil cap , a lot not just a little . I’ve had a head gasket pressure test and sniffer test done which it passed . I’ve had the oil changed as it needed doing and for peace of mind but after only two drives it’s back again not a lot this time because I’ve checked it sooner the 1st drive was not even a mile but the second was around 60 miles motorway a lot of it . No coolant loss or loss of power . Any advice would be e greatly appreciated 

Andy 

1 hour ago, Andy Harrington said:

Hi , new member Andy .

Ive had my 2011 s3 for 10 months and have had milky residue on my oil cap , a lot not just a little . I’ve had a head gasket pressure test and sniffer test done which it passed . I’ve had the oil changed as it needed doing and for peace of mind but after only two drives it’s back again not a lot this time because I’ve checked it sooner the 1st drive was not even a mile but the second was around 60 miles motorway a lot of it . No coolant loss or loss of power . Any advice would be e greatly appreciated 

Andy 

Hi could well be a blocked/ failing PCV valve on the cam housing, not sure if you can replace the valve or its incorporated in to the cam cover. Short journeys a lot of the time wont do it any favours.

Steve.

Yes, the BMW M54 engine suffers from this due to short journeys, once it has a good long trip out it usually clears it up.👍