Question about BMW 318

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The oil filter cap/dome on my 1997 BMW 318i will not undo when I turn it anti cloackwise. There is no bolt holding the cap/dome onto the oil filter housing but on the plastic dome there is a small marking in the centre which could be the head of a very narrow screw bolt. But I don't think so. I am turning the plastic oil filter cap/dome with the correct wrench but it just won't budge.

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There is a cilinder located at the front of the motor with one bolt on top in the very middle. just losen that bolt and pull the top off and the oil filter is just inside.
when you raplace it dont over tighten or you could break the cap.
The oil filter is on top of the engine driver side, a little more toward the center of the engine, under a 2-1/2" to 3-1/2" hard plastic or metal cannister(black). The cannister has a dome shaped top. Must use oil filter wrench to remove/install.
This is how the oil filter cap looks in your car :-- check fig:--
its BMW : 318i / 318i Convertible / 318is / 318ti / Z3 1.9
The oil filter cap/dome on - ef5a202.jpg
And this is the wrench which you will require to loosen this filter cap.
Cup design allows easy filter removal and installation from the end of the filter, even in tight locations. Use with 3/8" square drive. Fits 76mm Filters with 14 Flutes.
check fig:---

For any other part if you require for your car.please click on this link below
In case if the oil filter screw cap is not getting loose.Then spray wd-40 on the sides of the cap and let it remain for 1 hour.Then try again.If still very tight .Then spray it again but bit more quantity .Then check again after some time.It will get loose.The very last option is to cut the oil filter cap with the hexo blade.The pull the remaining with a plier.
But the spray will help.
Thanks. keep updated for any more can rate this solution and show your appreciation.

Posted on Jul 13, 2010

  • china_networ Jul 13, 2010


    Everything you said sounds right.

    One question. You said .........there is one bolt on top in the very middle. just losen that bolt and pull the top off and the oil filter is just inside. ...........

    but the photo you sent me (which looks exactly correct) has a thread on the lower side of the dome ... so it doesn't look like there is a bolt through the middle that needs to be loosened.

    Can you check the photo and see if there really is a bolt going through the centre.

    There is a tiny marking in the middle of my plastic canister but I don't think it is wide enough for a bolt to go through.

  • raj somaiya
    raj somaiya Jul 13, 2010

    very correct.Good question.

    about the bolts i would say that.On some 318i model there is a same cap with bolt on top.But on some 318i model there is same cap with flat top and no bolt.Its a nut type bolt.
    May be in your cars oil filter there is no bolt its a flat top.But this wrench will help in both types of oil filter removal.It actually fits on the filter and makes its loose internally when you rotate it.and makes whole filter Assembly loose.
    Thanks for keeping updated with your query.


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