Engine - Oil Residue Near Oil Filler Cap
SI B 11 03 09Engine
March 2009
Technical Service
SUBJECT
Engine Oil Residue Found Near Oil Filler Cap
MODEL
E90, E92 and E93 (3 Series) M3 with S65 engine
INFORMATION
An oil residue may be seen on the cylinder head cover,
located in the vicinity of the oil filler cap, a few days
after topping or refilling the engine oil.
Very often after removing the oil cap, the cap is laid
upside down to prevent the crankcase side of the cap
from being contaminated. When the cap is stored
upside down, this allows the engine oil to seep into the
area of an oil cap plastic housing that is not sealed by
the gasket. When the cap is reinstalled, the oil will leak
from the unsealed area onto the cylinder head cover
surface.
After removing the oil filler cap, store the cap in the
upright position on a clean shop towel, as shown in the
illustration. The upright position will eliminate the
possibility that the engine oil enters the unsealed area
of the cap plastic housing.
Do not replace any parts for this condition; please educate the customer when necessary.
WARRANTY INFORMATION
Information only
Disclaimer