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What engine oil? 1800 1970

posted by  Dave B on  Thu Apr 24 10:21 CST 2003
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last visit: Fri Sep 26 19:07 CST 2014
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This may seem like a stupid question, but what weight oil should I be running in my B20E big bore. The engine has about 20K since the rebuild, doesn't run hot and doesn't burn any oil (although it seeps out the head gasket and comes out the oil cap a bit (PCV system is in fine order).

As I recall from owning an 1800 many, many years ago, the recommended was 10w-40.








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    What engine oil? 1800 1970

    posted by  mcduck on  Thu Apr 24 14:08 CST 2003
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    10W-40 dino oil takes more VI improvers to meet spec than any other grade.
    This is regarded as undesirable because when they wear out, the oil is quite degraded.
    I'd go with 10W-30 synthetic, which is what I use in my fairly new B-20.








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    What engine oil? 1800 1970

    posted by  Phil S. on  Thu Apr 24 11:02 CST 2003
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    I use 10W-40... if it stays in the motor pretty well, you might consider going to a synthetic oil.

    If it leaks at the valve cover gasket, the usual cause is dimpling of the cover around the hold-down bolts. Then you try to tighten it further and the dimples get bigger. It's very easy to straighten the cover by supporting the dimpled edges upside down on a piece of wood and doing some careful hammering with a drift. Those little iPd gadgets that go between the bolt head and cover work well to prevent dimpling in the future, but you have to make it straight first.

    With a alloy cover, I use the rubber gasket glued to the head.

    New rubber gaskets for the oil filler cap are available. If it's not pretty stiff to turn it on and off, it's time for a replacement.







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