Re: Re: Oil Pressure Problem Relieved

Posted by Mark on February 29, 2004 at 06:16:39 from (209.151.114.75):

In Reply to: Re: Oil Pressure Problem Relieved posted by Tommy H on February 28, 2004 at 18:49:11:

I think the lights are set so low that they are essentially useless as an indication instrument. By the time the light comes on, you need to head for the shop (for an overhaul). I think manufacturers do that so people aren't in the dealership all the time with blinking lights, being Detroit likes to recommend 5W-30 (to meet govt. mileage requirements)and that stuff sucks when it's even warm outside.

I have compared lighted engines (tractors and cars/trucks) to presure gauges on the same engine (I installed for troubleshooting). On the equipment I was measuring the pressure could get down to 10psig before the light would come on.

This is especially important on cars with high volume low pressure systems, which I think my Tahoe has. It has a gauge, and if you put 5 or 10w-30 in it and turn on the ac and run 5 miles down the interstate in the summer, then let it idle, the oil pressure is less than 20 psig. But if I put OIL,REAL OIL (15w-40 truck oil) in it it will hold 30 whereas it was at 50 when cranked....new truck.

Now my Dodge is a different story. That sucker is 6 years old and holds 60 psig of oil pressure regardless....only time it moves off 60 is when the ignition key is off and during the first few seconds when first started.

Mark

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