I've had the BMS cowl filters on my 135i for about 7 months / 5,000 miles now. I am starting to notice a "film" forming on the inside of my windshield every week or so. I wipe it off, and a week later I can see it starting to build up from the bottom up. Anyone else with the cowl filters experiencing this? Do they need to be cleaned / replaced? Or is it something else?
I believe my valve cover gasket may be leaking slightly, and only thing I could think of is it's some film / oil vapors being brought in through the vents?
I believe my valve cover gasket may be leaking slightly, and only thing I could think of is it's some film / oil vapors being brought in through the vents?