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Old 10-20-2005, 10:06 PM
Join Date: Jan 2005
Location: Raleigh, NC
Posts: 28
Oil leaking from oil cap

After changing the oil and filter in my 1985 MB 300TD (172,000 miles) I cleaned the area immediately around the cap. Its usually caked with oil. The next day I noticed a slight amount of fresh oil leaked out from the cap.

The same thing is happening to my 1983 MB 300D (352,000 miles).

The oil caps don't look worn out and one looks brand new.

I use Delvac 1 and B100 but it appears the issue existed with the PO too.

Is this normal?


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Old 10-20-2005, 10:43 PM
pawoSD's Avatar
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,332
No that is not normal, neither of ours leak. You could try getting a couple new caps, or maybe your crankcase pressure is high, is the vent tube working ok/unplugged? Generally there is no pressure on the cap, so I would wonder why it would leak....I'd just guess a worn out cap. I used to have a metal one, but the stealer lost it so they gave me a new style one. Neither leaked though....
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Old 10-20-2005, 10:43 PM
Ether's Avatar
Go S Class or go home
Join Date: Oct 2001
Location: Lawrenceville, GA
Posts: 758
Don't know if it's normal but my 80 300SD does it.

I replaced my cap a few years ago because I noticed some leakage. The new cap leaked as much if not more than the old one so I just decided to wipe it off every few weeks and not worry about it.

1980 300SD - 495k miles - 'The Ambassador'

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Old 10-20-2005, 11:03 PM
Registered User
Join Date: Apr 2005
Location: Austin, TX
Posts: 631
Is it possible that you turned the cap upside down during
the oil change?

If you did, oil runs into the area of the cap above the seal and then leaks out when the cap is installed right-side up. The solution is to never turn the cap upside down.
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Old 10-21-2005, 12:24 AM
Phil's Avatar
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Join Date: Dec 2004
Location: Sonoma County, California
Posts: 1,064
Take the cap off and remove the rubber seal ring then clean out the cap and the rubber ring. Put the rubber ring in other side up and put it back on the valve cover. Thats what worked for me.

1983 300SD
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