09-03-2013, 07:16 AM
That was the point I was trying to make. I would have never known that the heat and shear were turning my 10w-40 into a thin 20 weight in 2K miles without the analysis. A 20 weight oil at the temperatures I ride in will not provide a very thick protective film on the internal engine parts.
Since I used to routinely change the oil at 3K miles, I thought that was helpful info to know. YMMV.