JayBros
Well-known member
At first blush the report below doesn't look too pretty. The XPS 5W-40 synthetic blend sheared down to a high 20 weight on the cSt 100C scale in just shy of 4,400 miles. I have since learned that small engine (and the ACE 1330 is a small engine) oils that share a wet clutch and gearbox are expected to shear down 20-30% in the first 1,500 miles and it then stabilizes. Since many of us are approaching the age of dirt and the oils we grew up with were nowhere near the quality of today's products, unless we are petroleum engineers we just assume the oil will continue to degrade until we have toast for motors. I am presently running 5 qt. of Mobil 1 10W-40 motorcycle oil and see how it performs over 4,400 miles and will probably consider having it analyzed without changing if it shows at least equal to the XPS at that distance.
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