Serviced my car yesterday and when I went to change my spark plugs I noticed there was a buildup of oil at the bottom of the spark plug well in the hole for the 4th piston (right most plug. I think that’s piston 4(confused) ).. the rest were dry as expected
I have a 2008 Vauxhall Astra 1.6T (Z16LET)
It seems quite excessive.. could it possibly be a valve cover gasket? If so, how much would it cost to repair?
Or could it be something else?
Not should if I should be very concerned.. the car is running great(shock)