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Old 07-10-2003, 07:18 PM
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mike690003 mike690003 is offline
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Join Date: Apr 2003
Location: Miami,FL
Posts: 807
I have the standard bosch coppers H9DC

Would you say that the 10w-30 oil is too thin and leaving past my valve guides?

I drive about 100miles a week and I add about 1/2 quart a month, so its about 1/2 quart every 400miles, in city driving. I rarely drive highway.

Will 20w-50 oil stop the fouling( by being too thick to past through the valve guides)??

The H9DC bosch comes pre gapped, should I adjust the gaps higher than how they come??
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