Has anyone tried a 5W20 or 0W20 in a Toyota sludge engine?

[Alan]

In Busters UOA(a Corolla calling for 5W30)with M1 0W20,it showed excellent wear numbers and a high TBN.The 100c viscosity was actually closer to a 30W then a 20W. I feel that a lot of the good UOA's we have seen has more to do with the quality of the oil used over the viscosity of it,be it higher or lower. The Motorcraft 5W20 has shown pretty excellent results as well as M1 0W20 in pretty much every UOA. These Toyota V6's seem to do better with a high quality stable oil that won't shear to badly. Wonder how these lighter viscosity would do in this tough,tough application like a Toyota V6? Toyota engineers must of known that Dino 5W30 would shear down quickly to a 20W in these engines so I am guessing it wouldn't hurt to much to go straight to it in a more stable form. Heck,it's gotta be better then dino 5W30 in 7500 intervals.

 

[ToyotaNSaturn]

quote:

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Originally posted by Alan: Toyota engineers must of known that Dino 5W30 would shear down quickly to a 20W in these engines so I am guessing it wouldn't hurt to much to go straight to it in a more stable form.

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I don't believe the engineers (read: bean counters) knew that the results would be so rough on oil. After owning one of these beasts, I wouldn't go thinner in this engine at all. Amsoil xW-30 or M1 10w-30 are the best choices available IMO.