Question about 1994 Chevrolet S-10 Blazer

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Low oil pressure

When warmed up it is around 20 idk y maybe u can help?

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Thats normal for an older engine

Posted on Oct 25, 2008

This is a common problem with higher mileage engines because of crankshaft, rod and camshaft bearing wear. You should test the effectiveness of the oil pressure sending units to determine they are functioning within normal parameters. A service manual maybe required to identify, how to test and to determine pressure ranges.

An easy fix to increase oil pressure is to use a heavier weight (higher viscosity number) oil, like 20W-50 - a straight 30W oil will work okay during the summer months. 20W-50 oil will work okay down to temperatures of 30 degrees, but you should use 10W-40 oils for lower temperatures.

Another fix and one that is generally recommended for long term benefit is to replace the oil pump with a new unit. The gears of the existing (OEM) one are generally worn from many miles of use. The increase in oil pressure may only be 2 - 4 psi, but could be enough to quiet the oil pressure warning system. Some later model vehicles with the same or larger displacement engines may have slightly larger oil pumps that can be retrofitted to earlier ones. You will need to research this for availability. If you find one, then this is the best way to go, aside from a complete engine tear-down and bearing replacement.

There is one other consideration although some might refer to this as the "snake oil" method. There are certain oil additives in the marketplace that could increase oil pressure. I cannot endorse any of them, but you could try one or more of them before considering the other options. I believe "Engine Restore" is one brand name. Again the heavier viscosity oils will do more for increasing oil pressure.

Good luck.

Ron









Posted on Oct 25, 2008

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