Quote:
Originally Posted by catmandoo62
i bought a suburban that was suposed to run on 5w30.it came out of arizona and evidently the guy thought he needed better oil pressure so he ran 10w40.it ate the oil pump.the ls engines use an oil pump like a transmission pump.it mounts on the front of the crankshaft.and they do not like thick oil.so i would shy away from it.
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I am not sure the thickness of the Oil is the entire story.
Some of the V Detroit Diesels have a similar Oil Pump on the front Crank end and the sometimes crack. They were designed to use 30-40 wt Oil when the Engines first came out.
I am guessing that that Crankshaft vibration, flexing stresses and thrust also are effect the Oil Pump.
In any event when I was doing a partial rebuild the Parts Guy told me about the issue and sure enough the Oil Pump was cracked and that is what was keeping the Engine from Rotating.