4th Gear Member
Join Date: Mar 2005
Location: City of Rain, PNW
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Normally that would indicate, coolant mixing with the oil (head gasket) it wont always show on the dipstick,or you may have a crack in the head allowing coolant in that way thus no sign on the dip stick, you could try the seafoam route, but I do think you have a head problem somewhere.
Some light brown goop under the cap by itself is not a problem as all engines have some moisture in them and it has to condense somewhere, BUT when it is combined with an engine loosing significant amounts of coolant that means you have a leak from the cooling system into the crankcase...big problem...It could be coming from the head gasket or many other areas.
it's the headgasket man, I dealt with this same exact problem for 2 years before I traded in the bimmer. I did a pressure test and everything, changed everything coolant related except the headgasket, because i didn't want to mess with it. The car never overheated either, just started loosing coolant randomly and would vary randomly from running normal to losing coolant here and there, very hard to pinpoint, the only thing I didn't replace was the headgasket so I'm 99% sure that's your issue.
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