Oil and Oil Filters
Chevy Impala
Chevy Suburban

2002 Chevy Impala with a low oil pressure what to do?

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Wiki User
2006-09-03 16:22:57

Before we look at causes of low oil pressure, a couple of

suggestions. Make sure you are using the correct weight oil and the

correct amount. In this vehicle it is more than likely 5w-30 and

4.5 or 5 quarts. Also remove the filter and install an AC/Delco

filter. The AC/Delco is a highly rated filter and is all I would

use in a GM vehicle. Make sure to use the correct filter. There are

many causes for low oil pressure but the most common is engine

wear. As the engine wears and gets sloppy, the pressure will drop.

But this is a gradual process, it doesn't happen all of a sudden.

If the oil pressure loss is sudden one, then we have to look at the

oil pump and pressure relief valve. It is possible the pressure

relief valve has some junk holding it partially open or the spring

in it is weak or broken. Only taking it apart will reveal the

answer. But before I do any of that, I would use a mechanical

pressure gauge and get an accurate oil pressure reading. It could

be a bad oil pressure sending unit or gauge giving you a wrong

reading. If there is valve or engine noise when the pressure drops,

then chances are it is a pump problem. One thing that will help is

to use a heavier oil in the engine, say 10w-30. This won't cure the

problem, but it will help for a while until the root cause can be


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