I thought if i had oil in the coil boots my valve cover gaskets were unseated. Last time i changed plugs (Denso Iridium IK20) I found a few boots had oil inside and thought i remembered reading the VC gaskets had to be off somewhere to allow that. Hadn't seemed to be interfereing with performance though I didn't take any reading and since I wasn't set up at that moment to swap the gaskets I just cleaned the boots out best I could and reused them. If i want to replace w/new boots and I find oil returned in some of the existing boots is this definitely an unseated VC gasket and so should be refitted before replacing the coil boots? I kind of think I ought to be getting slightly better gas milage current; normally around 21 average hwy/city but power, running and idling all seem fine. Hell a local BMW dealership tech even told me it sounded better than most M60's he'd heard.
1995 540i Manual build 1/95