My V8 has always had mayonaise on the inside of the oil filler cap, in winter and steam/water vapour coming out from the same place....is this normal? It isn;t head gasket gone, before anyone suggests as I have recently done that job. Any views gratefully received.
if you have had your head gasket done recently its possibly residue still inside the engine from this. i would get some good engine flush and put that through the system, then fit a new oil filler cap and see how you get on