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Old 09-08-2019, 10:45 PM   #6
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Join Date: May 2010
Location: MN
Posts: 6,322
Default Re: 1953 239 flat head

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You can get straight 30w diesel oil from most places. But were you live the added gauge comfort wouldn't be justified.

I thicker oil will give you a higher reading. As long as your north of 0 on a regular flathead I wouldn't worry about it. Even 10lbs at hot idle on a flathead is good.

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