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Flathead oil pressure change
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04-10-2019, 03:39 PM
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Drbrown
Senior Member
Join Date: Oct 2013
Location: Glens Falls NY
Posts: 1,267
Re: Flathead oil pressure change
2 x JSeery's recommendation to use a mechanical gauge.
I think Ol'Ron would say 15 lbs hot is okay at idle. At Idle, my mechanical gauge starts at about 65 lbs cold and when hot reads abt 20 lbs. I use 10w-30.
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