5w-20 for 98 Trooper?

[427Z06]

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Originally posted by trooper99:
Double that on the no effect. I ran two cycles of AutoRX at 90K on my 99 trooper, no help.

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Perhaps once these oil drain holes get plugged nothing will help, implying that if you AutoRX prior to this, it may do some good. But that's all conjecture on my part.

 

[Gary Allan]

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Originally posted by Lazy JW:

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Originally posted by Winston:
I do not think the thinner oil will make much difference whether or not the oil will drain back through the oil control rings. Once they get plugged up with carbon, the viscosity of the oil will not make a difference. ARX is your only hope.

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I am hoping that the Auto-RX will un-plug the drain holes, then maybe a thinner oil will drain back more readily. I don't intend to try it until the Auto-RX is completed. Not sure what brand, maybe some of that fancy Pennz Platinum I keep reading about here. Lots of time to ponderize before the RX treatment is done. Decisions, decisions....

Thanks,
Joe

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You may want to read Dr. Haas' writings on oil flow/migration in the upper ring area. I can't quote it ..or even remember it fully, but there was a distinction between lighter and heavier oils in this migration. Given that you have an engine that this presents an issue, it may alter your decision one way or the other. Seeing as the fine doctor is a believer in lighter is better, I tend to think that this referenced material (SAE paper type stuff) supports the use of lighter oils. Now, admittedly, any "presentation" typically isn't going to include data that is counter to the purpose/intent of the presenter ..but that surely doesn't automatically discount the data presented.

 

[JTK]

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Originally posted by Ramblin Fever:
..There has been one guy who ran 5w-20 oil in his 2002 3.2L dohc engine and didn't have any issues, and in fact, stated that it ran real smooth. But only ran it for a few thousand miles before going back to a 5w-30..

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That one guy would be me!

Yes, my 2002 3.2L (same as the 3.5) ran smooth as silk on the 5w-20. I ran it for 2 OCI's, about ~8Kmi. No measurable consumption, noises, etc.. I couldn't stop 'experimenting', so I went from 5w-20 to Shell RT 5w-40.

Joel