1998 Jaguar XJ8 Q&A
1998 Jaguar XJ8 Question: Why do I have blowby coming out of my valve cover?
That has a 4.0L engine. It may have a broken piston ring! Have a compression test, cylinder leakage test done. On removing the spark plugs see if a plug is oil fouled, have the garage use a boreascope to examine the cylinders for scoring or damage. - patrick mannion