Question about 1988 Volvo 740

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740 Oil Cap Leaking, Lots of Oil

My sons 88 740 has started to leak oil from the oil cap. This has started to happen after he topped it up with oil. Is there a breather hole in the cap? Also is there a rubber type seal around the base?
Thank you

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  • Moishe Katz Mar 12, 2009

    On my car, the issue seemed to have been that the viscosity of the oil caused blockage in the flametrap or vacuum hoses and they needed to be cleaned out. I also have an 88 740.

  • cindyeasley May 11, 2010

    How much oil did he put in it?My daughter had this happen---she did not tighten it down.



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Presuming the oil is coming from around the filler cap..theres usualy a rubber seal around the base, these can become brittle and break,sometimes quite a large piece (1/4 inch) can break off making a fair old leak from the oil splashing around from the cam, replace it with a NEW one, should cure problem

Posted on Jul 26, 2009


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