Question about 1994 Jaguar XJ6

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Xj40 head gasket

My 4L sovereign has white goo in oil filler cap, but seems fine in every other way. Is this always a sign of head gasket trouble or could it be something innocent?

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  • operaman May 21, 2008

    after consulting several xj40 experts, I discover the symptoms are very common and indicate nothing more than condensation in the breather pipes due to short journeys not running the engine up to temperature! Lucky I didn't rush in for a head gasket job....

  • blompod Jan 07, 2009

    My 94 XJ40s been diagnosed with a blown head gasket, been quoted 1000 AUD to fix it. I dont think thats too bad a price. Ive changed head gaskets on old english cars but I guess the Jag would be a far more compicated exercise.



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Greetings Operaman,

Unfortunately, the symptoms you describe as known as "gelling" in which the antifreeze seeps into the crankcase, indicating that your head gasket is indeed need of replacement.

I strongly suggest you refrain from driving your car and take it to get fixed. Reason being is because continuing to drive it can likely result in warpage of the head (which sits about the block).

Hope this helps.

Posted on May 18, 2008

  • Frankie Cruz
    Frankie Cruz May 23, 2008

    Greetings Operaman,

    I'm sorry you felt that my solution was Inappropriate, as you chose to flag it that way.

    However, allow me to advise you that head gasket issues on Jaguar models during the era that your car was built were very common. So although you may not feel the need to rush in for service, I assure you that the symptom you described is a sign of things yet to come.

    Best of luck to you.


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The AJ6 engine also does this when the oil is overfilled.

Posted on Dec 13, 2008


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