losing oil pressure after a few minutes drive from 1991 GMC truck?
the dipstick shows no pressure after running for so long. I check the oil when cold, there is no full once it is warmed oil goes all the way up to bat. Do I need a new engine, gauge or oil pump?
If you do not overheat and engine is not noisy changes are sending unit for the gauge is twisted. If you melt the lead of the gauge and it works right needle must jump all the way to high. If this is not the gauge is twisted. On both the sending unit goes in general first.
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