Influence of Engine Oil Viscosity on Piston Ring and Cam Face Wear
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The article is from 1993? What makes today the day we need to post this?
Thanks
I'd love to see a similar test, but with the latest SN+ formulations - 0W-16, 0W-20, 5W-20, 5W-30, 0W-40
wemay
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Originally Posted by A_Harman
Originally Posted by bepperb
The article is from 1993? What makes today the day we need to post this?
The latest skirmish in the ongoing war of words between the thick and thin factions.
It's not a war of words. Just sharing a technical paper, which although dated, still holds merit in countering the 'thin oil is water' extremist segment of the thick oil fans, most of which are not extremist so lets not twist my words either. This is in no way an attempt to say thin protects better.
Originally Posted by bepperb
The article is from 1993? What makes today the day we need to post this?
The latest skirmish in the ongoing war of words between the thick and thin factions.
It's not a war of words. Just sharing a technical paper, which although dated, still holds merit in countering the 'thin oil is water' extremist segment of the thick oil fans, most of which are not extremist so lets not twist my words either. This is in no way an attempt to say thin protects better.
wemay
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So in layman's terms,are they saying thicker protects better,or that it doesn't really matter and that they protect the same?
Originally Posted by aquariuscsm
So in layman's terms,are they saying thicker protects better,or that it doesn't really matter and that they protect the same?
Depends what you are looking at, one data set indicates that when you get to HTHS of 2.6, going above that doesn't give you any noticeable additional wear protection for those scenarios.
Another one indicates that thinner oils protect better at high RPMs with low loads and the thicker oil protects better at low RPMs with high loads.
I find that last point interesting as it appears w20 oils might be perfect for 4-bangers that turn higher RPMs in general where as if you have a larger engine (OR any engine with CVT) that spends its time in the lower RPM range, you might benefit more from running something like a 0W-40.
There isn't a one-answer-for-everyone here, sadly.
So in layman's terms,are they saying thicker protects better,or that it doesn't really matter and that they protect the same?
Depends what you are looking at, one data set indicates that when you get to HTHS of 2.6, going above that doesn't give you any noticeable additional wear protection for those scenarios.
Another one indicates that thinner oils protect better at high RPMs with low loads and the thicker oil protects better at low RPMs with high loads.
I find that last point interesting as it appears w20 oils might be perfect for 4-bangers that turn higher RPMs in general where as if you have a larger engine (OR any engine with CVT) that spends its time in the lower RPM range, you might benefit more from running something like a 0W-40.
There isn't a one-answer-for-everyone here, sadly.
As badtlc stated higher HTHS oil doesn't protect any better than lower. Until you reach the limit of the lower HTHS oil. Low HTHS oil doesn't seem to handle high heating, higher stress and contamination. There is a limited amount of reserve in low HTHS oils.
Remember oil grade is not, necessarily, the topic here. But oil grade does determine HTHS. A 20 can border on being a 30 and a 30 can border on being a 20. HTHS (and Kv@40) determines Hydrodynamic drag hence FE.
Remember oil grade is not, necessarily, the topic here. But oil grade does determine HTHS. A 20 can border on being a 30 and a 30 can border on being a 20. HTHS (and Kv@40) determines Hydrodynamic drag hence FE.
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