Chevrolet Blazer Oil Gauge Problem

4 messages, Last post on Mar 02, 2009 at 7:16 AM

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#3 of 4 by elementkp555 Mar 01, 2009 (8:40 pm)
it has almost 90,000miles on it, and I'm comming up for an oil change, still have like 700miles before its needed and it's been less than 6months. I going for an oil change this weekend so we'll see if that helps, thanks
#4 of 4 Normal oil pressure by duntov Mar 02, 2009 (7:16 am)
If the bearing clearances are within specification, the oil pressure should be 40 - 50 lb. when the engine is cold at fast idle speed of 1000 RPM. When the engine reaches full operating temperature of 185 -190 degrees, the oil pressure can as little as 15 lb. at normal idle speed of 600 RPM. The viscosity of the oil (weight) has some effect on oil pressure but not as much as the oil temperature. Once the engine reaches normal operating temperature, the normal oil pressure should be 40 - 50 lb. when the engine is running any speed above 1000 RPM. The oil pump has a pressure relief valve that regulates the oil pressure. The pressure relief valve opens when the oil pressure reaches 50 lb. in order to prevent a hydraulic lock and damage to the oil pump and oil pump drive.