My 1999 E39 with 80K kms on it started running like a few plugs had failed. It appears oil has leaked down onto and fouled the plugs on No. 1 and 2 Cylinders on MY Left hand side ( Mine is a R/H drive here in Australia). Apparently some sort of gasket failure. Anybody else had this problem before ? Any thoughts from you guys regarding this as a common or rare problem ? Thanks all............KennyGDownunder