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How tight do you tighten the oil filter?

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Old Aug 23, 2009 | 08:34 AM
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How tight do you tighten the oil filter?

Same as title.

How tight do you tighten the oil filter on a C300.

I think I must have overtightened mine causing the gasket to shift and leak.
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Old Aug 23, 2009 | 11:11 AM
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You dont have to tighten it hard at all, 25Nm max!
I would remove it and check the upper o-ring

Last edited by vic viper; Aug 23, 2009 at 11:15 AM.
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Old Aug 23, 2009 | 11:51 AM
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vic,

I didn't have any problems on my first oil change last year. I think I kept turning it with a rachet wrench till you could tell that it had gone as far as it was going to go.

I must not have tightened it enough this time. I'm off to get a torque wrench.

Thanks
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Old Aug 23, 2009 | 12:29 PM
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whoaa.... I haven't change oil on my MB yet but I've always hand tighten the oil filter on every car I've ever changed oil... You can easily overtighten it and cracked the o-ring if you use a wrench...
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Old Aug 23, 2009 | 12:56 PM
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jog

I now have a corner of my garage painted with mobile1 by hand tightening plus 1/3 turn.

You might want to hold off on the hand tightening till I get this resolved.
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Old Aug 23, 2009 | 12:57 PM
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No risk of cracking the o-ring, but the lid itself could have cracked.
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Old Aug 23, 2009 | 02:58 PM
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......oops,

In another thread I asked the same question and someone suggested that I had the o ring in the wrong grove. I was certain their car was different until I looked at the instructions that came with the filter and sure enough, it goes in the second grove. I put it where intuitively it seems that it would go but that's wrong.

As for hand tightening, I don't know. I put the torque wrench on it to 25Nm and ran the engine for a while to see if it would leak. Didn't leak.

I'd like to thank vic and jog who joined in this discussion.
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Old Aug 23, 2009 | 03:41 PM
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Originally Posted by JimPap
Same as title.

How tight do you tighten the oil filter on a C300.

I think I must have overtightened mine causing the gasket to shift and leak.
Get a quality torque wrench and follow the specs. Vic suggested 25 Nm and that seems reasonable unless the shop manual suggests otherwise.
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Old Aug 23, 2009 | 04:46 PM
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I did buy a torque wrench to use on filter tightening this afternoon.

But that wasn't the problem. I had put the big o ring on the top grove instead of the next one down like you're suppose to.
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Old Aug 23, 2009 | 04:55 PM
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Originally Posted by JimPap
I did buy a torque wrench to use on filter tightening this afternoon.
Good - you can never have too many tools, especially power tools!

Originally Posted by JimPap
But that wasn't the problem. I had put the big o ring on the top grove instead of the next one down like you're suppose to.
Ouch!
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Old Aug 23, 2009 | 05:04 PM
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Bad thing is that by the next time I have to do this, I'm likely to have forgotten the whole thing with o ring placement.
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Old Aug 23, 2009 | 05:11 PM
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Originally Posted by JimPap
Bad thing is that by the next time I have to do this, I'm likely to have forgotten the whole thing with o ring placement.
Do you keep a maintenance log of any kind? If so - perfect place to record the details.

I use Automotive Wolf to track things. It would not let me forget.
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Old Aug 23, 2009 | 06:28 PM
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Originally Posted by Jen_Kenne
Get a quality torque wrench and follow the specs. Vic suggested 25 Nm and that seems reasonable unless the shop manual suggests otherwise.
+1 - Hand tightening is no good either. This is not a spin on cartridge filter!!
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Old Aug 23, 2009 | 07:24 PM
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My filter cap had a dot of paint on it marking the top with the bottom, I hand tightened the filter cap til the paint mark once again met up, it was snug enough that I had zero doubt it would be a problem with leaking, so far so good.
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Old Aug 23, 2009 | 08:00 PM
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Correct about the "dot", if you use that as a guide you can't go wrong. In any case, you get a sense right away that you've tightened enough, there is a natural stop in it.

There is a printed guide with the filter that shows you where to place the top O ring, its not at the top most positions, its one "level" down from there.

Did you drive very far, did you get much of an oil leak? That could really be a mess or could even cause an oil fire.
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Old Aug 23, 2009 | 08:05 PM
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Originally Posted by nyca
Correct about the "dot", if you use that as a guide you can't go wrong. In any case, you get a sense right away that you've tightened enough, there is a natural stop in it.

There is a printed guide with the filter that shows you where to place the top O ring, its not at the top most positions, its one "level" down from there.

Did you drive very far, did you get much of an oil leak? That could really be a mess or could even cause an oil fire.
Or worse - to use David Hobbes term - it could have caused a "kablammo!"
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Old Aug 23, 2009 | 08:11 PM
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filter cap inatall

Originally Posted by JimPap
Bad thing is that by the next time I have to do this, I'm likely to have forgotten the whole thing with o ring placement.
The filters I have on hand have a diagram showing where the o-ring goes.

"If all else fails, read the instructions."
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