| carcrazy | -- 03-10-2026 @ 7:03 AM |
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What should the normal operating oil pressure be for a 1940 Mercury with the original oil pump?
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| Barney | -- 03-11-2026 @ 7:40 AM |
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Carcrazy I have a '40 Ford with an 85 hp flathead. I'm using 10w-40 conventional oil. It'll push 80psi the initial mile or two, then decrease to about 12psi when warm and low rpm. I've changed viscosities; doesn't make much, if any, difference. I wouldn't be concerned if you feel it's low, unless it's crazy low. Barney
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| carcrazy | -- 03-11-2026 @ 10:33 AM |
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Barney, Thank you. That is reassuring. It seems that old Ford Flatheads don't need a lot of oil pressure to be happy! carcrazy
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| same | -- 03-11-2026 @ 7:26 PM |
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I have my '37 221 85hp for 6 yrs and oil press. cold will run 25psi till warm then 20psi at 45mph then idle at 12-15psi 10w30 conv. or10w40. some say not to be concerned with those numbers. ive read on the barn that even 8-10psi oil is getting where it needs to be.i too was concerned of oil press. in the flathead for back in the 50s 60s 70s v8s seems like oil press was usually 40-60 psi. Tom.
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