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Country Discussion Topics
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1994 Chevy Silerado, 6.5 Liter Diesel (Oil pressur
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Shawn Price    Posted 11-17-2004 at 18:14:52       [Reply]  [Send Email]
I own an 1994, Chevy Silverado 1500, 6.5 Liter turbo diesel. I am experiencing oil pressure loss when I tow a trailer or put the truck under any bit of load.

Riding down the highway or even in town, the oil pressure remains constant at half or 275kp. When towing anything, after ten or so miles the oil pressure drops off dramatically down to red line or below 100kp.

I have changed the oil with 15w40 Castrol XL and added a quart of Lucas Oil treatment. I have also changed my engine oil coolant rad on the tow package.

I am at a loss and any suggestions would be greatly appreciated. Thanks, Shawn


Terry    Posted 11-18-2004 at 04:23:20       [Reply]  [Send Email]
Might want to check this with a mechanical gauge to verify the electronic unit in dash. The sending unit in the engine can get warm and cause abnormal readings.


mud    Posted 11-17-2004 at 19:46:54       [Reply]  [No Email]
oil pump?


reason why    Posted 11-18-2004 at 05:23:35       [Reply]  [No Email]
on our 6.2 diesel we had same thing. new pump cured it.


Bob    Posted 11-17-2004 at 18:54:40       [Reply]  [No Email]
Clean the engine oil cooler that's ahead of the radiator. Take the top half of the radiator shroud off, exposing the area between the AC condensor and the radiator. Often dead bugs and debris build up in this area, causing reduced airflow through the engine oil cooler, AC condensor, and radiator. Remove the grill, if necessary, and put a light in the fan area behind the radiator, and verify that the fins on the oil cooler, AC condensor, and radiator are clean, and you can see light through them.

Beyond that, you may have excessive rod, main, or cam bearing clearances. I believe some of these engines had tolerance problems with the cam bearing align bore.

How many miles (KM's?) on the engine?


Harrison    Posted 11-17-2004 at 19:51:07       [Reply]  [No Email]
I agree with Bob , that would be the first thing I would check.Also diesel said it all when he said ROTELLA. After that I would check the timing, that makes a night and day difference in performance and economy especially under a load. Good luck.


diesel    Posted 11-17-2004 at 18:41:46       [Reply]  [No Email]
Diesel engines use a different oil than a gasoline engine. I use Rottela oil in mine.That might be your problem.


James(Ga)    Posted 11-17-2004 at 21:12:36       [Reply]  [No Email]

I have never owned a diesel truck but owned 2 olds.diesels and only problem i had was with the injecter pump and i did use rottla 30 wt and no trouble other than pump.James


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