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Old 01-17-2011, 07:33 PM
rjk's Avatar
rjk rjk is offline
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Location: Atlanta metro area
Posts: 200
Oil filler cap

Opened my oil filler and there was a lot of creamy oil/water goo around the inside of the filler neck. I am NOT noticing any oil in the coolant NOR any other obvious signs of coolant in the oil (nothing on the dipstick). Just around the filler. So my mind travels to condensation or gasket leakage. Is this a viable scenario? I oiled up the gasket mating surface and it looks like there may be about 45 degrees of the gasket that may not be sealing. There wasere about 2 tablespoons of goo that I cleaned out. It has been about a month since I last had the cap off.

As an aside, I am only seeing gaskets for pre '93 vehicles. Do I need to buy a whole new cap for my '99 E320?

1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)
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Old 01-17-2011, 08:55 PM
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rjk, I would attribute the creamy goop to condensation. Commonly occurs due to frequent short trips where the engine fails to reach normal operating temperature.
Fred Hoelzle
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Old 01-17-2011, 09:02 PM
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Location: Green Bay, WI
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Best way to tell is to drain a little oil after the car has cooled. Oil floats and this at the drain lug the water will come out first - usually white/milky. If not, then as said above.

The gasket for the cap can be ordered. I just put a new one on myself and it seals much better.
1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
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Old 01-17-2011, 11:32 PM
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Location: California
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If it is just the condensation from cap or gasket, then just spend the $6 or $7 for an entire new cap.

1990 190E 2.6L
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Old 01-18-2011, 04:40 AM
Stretch's Avatar a shield of steel
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,457
What engine oil are you using?

Most modern expensive oils have additives that are meant to reduce this gunk.

1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior

Don't leave that there - I'll take it to bits!
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