Jim, what do I not understand about your table?
The Bel Ray out performed the Royal Purple with regards to load, is how I read it...
And Mobil 1 v twin is WAY down the list, it only climbed up close to the top when combined with 8.5% BGMOA...
For maximum load the Bel Ray is the highest -but when you add the high friction it does not do as well.
Heat from friction is something that is important because high friction creates more heat and more heat drops the load capacity.
These tests were done with controlled temperature, controlled temperature is not something that is possible with an air cooled motor, so this is an important consideration.
And yes, Mobil 1 is well down on the list of load capacity, but the load capacity has proven to be high enough for most stock operation and it is very resistant to oxidation from heat.
So the way the list of oil is sorted, the highest load capacity is at the top of the list.
But the list was not made with the idea that the best oil is at the top. Sometimes the best choice is going to be determined by climate, how the bike is used and even price and availability.
I can make a list of the top choices for my use and location -but then it's not likely to be right for someone else.
Royal Purple does the best job of meeting my requirements.
1. The load capacity is more than adequate
2. It generates very little heat from friction
3. It oxidizes very slowly which means I can do a 4000 mile trip without a change.
4. In testing I did that is not represented in the chart, I did some testing with a reduced load but I shut down the cooling system and let the temperature continue to rise until failure. The Royal Purple won that test -but that test may only be important to a few guys in the desert SW or a couple people in Australia that tend to run long days at high speed on hot days.
Most people will never see oil temps up there over 350 degrees.
