Small oil leak at oil filler cap - Mercedes-Benz Forum

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post #1 of 15 (permalink) Old 02-24-2007, 06:10 AM Thread Starter
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Small oil leak at oil filler cap

Hi guys, I have a small oil leak down the right the of my oil filler cap, topside. Should I just replace the cap, or is there something else to look for?

Thanks!
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post #2 of 15 (permalink) Old 02-24-2007, 06:30 AM
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Originally Posted by wjbarton
Hi guys, I have a small oil leak down the right the of my oil filler cap, topside. Should I just replace the cap, or is there something else to look for?

Thanks!
Just go to Duval's and order a new cap. It is very cheap, around $5.00. The gasket alone is less then $2

Duval Motor Cars
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post #3 of 15 (permalink) Old 02-24-2007, 07:45 AM
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You try wiping the gasket with W-D to clean it.

Last edited by rp41; 02-24-2007 at 07:50 AM.
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post #4 of 15 (permalink) Old 02-24-2007, 06:15 PM
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remember the oil filter cap has a big o-ring on it thats changed when changing the filter. that is what causes the leak from the cap. change the o-ring. if the cap is cheap enough, replace it too.
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post #5 of 15 (permalink) Old 02-25-2007, 07:08 AM
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Originally Posted by Streetglower
remember the oil filter cap has a big o-ring on it thats changed when changing the filter. that is what causes the leak from the cap. change the o-ring. if the cap is cheap enough, replace it too.
Thats why I had to edit my post above you, he's talking about the filler cap not filter cap. I made the same mistake
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post #6 of 15 (permalink) Old 02-25-2007, 08:18 AM
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I had the same issue however after replacing the cap i still had a leak. i had to replace the neck as well. to remove tilt forwards towards you and then spin left.
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post #7 of 15 (permalink) Old 02-25-2007, 08:24 AM
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Originally Posted by rp41
Thats why I had to edit my post above you, he's talking about the filler cap not filter cap. I made the same mistake
oh damn, my bad. well same thing happens. the gasket at the cap is the cause. so yes replace the cap.
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post #8 of 15 (permalink) Old 02-25-2007, 10:07 AM Thread Starter
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Yep guys, it's the oil filler cap not the filter... I'll try your suggestions and replace the cap first, then if I still see a leak I'll see about the neck (have to look into that one, didn't realize there was a neck)

Thanks!

- WJB
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post #9 of 15 (permalink) Old 03-17-2007, 01:04 PM Thread Starter
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Finally got around to replacing the cap w/gasket, was only $8 and change from a dealer. Wiped everything clean, will check for leaks after putting in a few miles this weekend.
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post #10 of 15 (permalink) Old 03-17-2007, 04:53 PM
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Even good gasket will not hold excessive blow-by pressure. If the leak reoccur -clean the breathing pipes.
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