- Joined
- Jul 8, 2011
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- 2,668
How do they do it?
There is the question; the $64,000 question.
The MA rated oil I looked at seem to have a moderate to high Phosphorus and Zinc additives. Thinking out loud, there are different lubrication regimes; the four main ones are:
- boundary,
- mixed,
- hydrodynamic, and
- elasothydrodynamic (rolling elements, gear teeth and cams)
Each regime probably has it's own unique means and methods to "more" slipperiness.
My point with the clutch is, in which regime does it slip? I doubt the point loading in a clutch comes anywhere near that of a flat tappet in boundary regime where the Zinc and Phosphorus additives are activated. The additives may contribute in other lubrication regimes but I have not read nor heard from others on it.
I think this point fits the thread here as my hunch is the test results presented here are probably looking at one lubrication regime in isolation - nothing wrong with that as I believe our Nortons may have special needs, be it lubrication or metallurgy.
This goes back to a link provided worntorn (you) provided earlier which I thought was an excellent point (assuming it is accurate):
https://mobiloil.com/en/faq/ask-our...trength-of-mobil-1-compared-with-royal-purple