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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old November 14th, 2019, 11:31   #1
Nero Morg
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Default Oil filter cap seepage

Well I've got an odd one. Seems my oil filter cap may be pushing oil. It was like that when I changed my oil last, so I cleaned it up. This was a few months ago. Was looking over my engine last night, and it's oily again. It's definitely the cap area, as it's seeping just down the front of the filter housing, starting at where the cap meets the housing.
I always pre lube the o rings before installing the filter. Are these caps known for cracking or leaking? I haven't pulled it off yet to inspect it further.
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Old November 14th, 2019, 12:11   #2
ahldailydriver02
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I would make sure you have your o ring still in place. Also I had one of the caps go bad on me before. I couldn't see any crack in it but it did the exact same thing that you are experiencing right now. I replaced my cap 150,000 miles ago and no problems since then.
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Old November 14th, 2019, 12:33   #3
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Replace the filler cap gasket. If that doesn't work, replace the cap. But it's usually the gasket.
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Old November 14th, 2019, 12:42   #4
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That big o-ring can get deformed or out of position, especially if over tight. Just take it off and have a look.
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Old November 14th, 2019, 16:53   #5
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I've only replaced that big cap o-ring a few times on each of the TDIs over their lifetimes (so far). Never had a leaker yet and had trouble on the occasion I replaced it with a new one. Seems like every VW I've come to own or work on has the cap way overtightened.
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Old November 14th, 2019, 18:23   #6
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you get the hengst filter with the white o-ring?

they aren't actually oil-compatible
leave one in solvent overnight, it'll be 6x the size it was and mushy
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Old November 14th, 2019, 19:24   #7
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Quote:
Originally Posted by [486] View Post
you get the hengst filter with the white o-ring?

they aren't actually oil-compatible
leave one in solvent overnight, it'll be 6x the size it was and mushy
No I've always used either Napa Gold or Mann filters, they both come with the black o ring. I'll pull the cap soon and see what's going on, it's due for an oil change anyways.
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Old November 15th, 2019, 07:16   #8
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The Mann filters (which I use) all have come with both the cap O-ring and the little one for the "stick"; I replace both with the filter.

If a new O-ring doesn't fix it then the cap has almost-certainly cracked where you can't see it. While it's POSSIBLE the housing is scored (which would prevent a seal) I very much doubt that happened.
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Old November 15th, 2019, 12:52   #9
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Well popped the hood and took a closer look, very slight bubbling here. Oh boy. I think I'll just order a cap to play it safe, because I always replace both o rings each time I do the oil.
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Old November 15th, 2019, 14:45   #10
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I had this problem once. The guy who changed my oil didn't take the old O-ring off, so I had two. I drove it for months before it suddenly started leaking profusely. Took off the extra one and everything was good.
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Old November 15th, 2019, 20:01   #11
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Note that you should never use ANY tools on that cap when removing the old O-rings. It's plastic -- score the groove where that O-ring rides and seals and it's done.

I just squeeze it with my fingers to get enough gap to grab, and off it comes. Ditto with the bottom one for the same reason.
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