Oil pressure loss

Asked by Oct 12, 2016 at 08:35 PM about the Chevrolet C/K 20

Question type: Maintenance & Repair

I have a 1980 Chevrolet k20,  with a 1975 .
7.4L , 454ci, . Originally it ran at idle with oil
pressure at 40psi and would go up to 50psi,
a few days after an oil change it started only
having 25psi on gauge, at idle and dropped
as I accelerate. It always had a small oil leak
so I changed oil pan gasket,  but problem
still exists with the oil pressure,  info on
what's going on would be greatly

4 Answers


Did you recheck oil level on some vehicles have to add another quart a few days after changing oil.

Yes, I check every day because im anal , and it's my baby


What weight oil did you use ? Did you change from what you normally use ?


Big blocks use 7 quarts if I'm not mistaken. Lower pressure while accelerating is either low oil level or something is wrong with the pickup tube

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