Toyota R&D on Viscosity

[Dr. T]

quote:

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Originally posted by AEHaas:
"A jump in HTHS by about +1.5 results in approximately 1/5 the wear. Now this relationship is not linear and flattens as one nears a 40+ weight oil."

The 40 and 50 wt oils should all show little no wear on used oil analysis. That is just not the case. Even my 515 BHP, 8,000 RPM Ferrari on M1 20 wt oil shows a great UOA. What is the excuse for that?

There has to be more involved here. And this is what makes motor oil so interesting to me.

aehaas

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And the reason is...............because UOA don't show the whole picture with respect to wear...(something else we learned here).

 

[JohnBrowning]

buster, I apoligize about my post above. I went looking for the information Molakule posted and I thought I cut it out but I must of copied my entire post from another thread! I did not mean for the top part of my post to be in this thread sorry!!!!

 

[buster]

John, no problem. This is what it's all about, debating and discussing. I'm not that sensative.

http://www.76lubricants.com/ProductDataSheets/Crankcase.htm

Regarding the HT/HS. It does matter but additive packages can make up for this I believe. For instance, their is a reason I believe why M1R and 76 NASCAR oil only have HT/HS of 3.0.

http://www.76lubricants.com/ProductDataSheets/Crankcase.htm

I've said this before but too many people sweat this A3 spec way too much.