Oil pump

[89 corvette]

Pressure fluctuates from 20 psi to 55 psi. While driving at normal speeds. 10 to 65, why?

 

[LLC5]

Pressure fluctuates from 20 psi to 55 psi. While driving at normal speeds. 10 to 65, why?

It needs to be diagnosed properly. Start with a manual pressure gauge installed and check the readings.