NancysToy
Motorbike Professor
Oh boy, can of worms time! First, let me say that comparing oils is not science. None of the manufacturer's spec sheets have the same information, outside a few commonly accepted parameters, like viscosity measurements. At that point, it becomes a matter of personal likes and dislikes, and that is my reasoning on the Mobil-1 Motorcycle oil. It is strictly personal preference, and I do not mean to imply the Mobil-1 isn't a top grade oil, or is less suitable in any way. My biggest concern with the Mobil-1 MC, other than the viscosity rating itself, was low temp and pumping viscosity figures that seemed to vary more widely between viscosity grades than other brands, and were significantly lower than other brands I researched. I don't know if that is good or bad, but it worried me that it was different.Scotty-- I am just curious to know what spec in the Mobil 1 Motorcycle oil didn't you like? It is JASO_MA rated which is the highest rating for any motorcycle oil. I do respect your opinion so I would like to know what you were looking at. I have always pretty much used Mobil 1 synthetic since they started rating their oil to the Motorcycle standards.:doorag:
As to JASO ratings versus API, I don't think it really matters as much with a liquid-cooled engine, although we all know Spyders get plenty hot. Nothing like temps in an air-cooled V-twin. Frequent oil changes to avoid thermal breakdown can compensate a lot for oils that deteriorate under high heat conditions, so I think you could satisfactorily use an oil designed for less strenuous service. As to the presence of phosphorus and zinc additives...the jury is still out. I find no solid information, even from JASO, indicating their clear superiority. JASO specs were put together expressly for motorcycles, so that is in their favor, but that doesn't mean API standards are inadequate, just not designed around bikes in the first place. BTW, the JASO-MA merely means it meets the standard and has no friction modifiers. There are no different rating levels.
In the end, for me and me alone, it comes down to two things. First, does the oil meet the manufacturer's stated spec? BRP specifes full-synthetic oil which meets API standard SL (and some previous standards), but not SM. They also specify the 5W-40 SAE grade. Of course their new oil does not meet their own specification! Heck, it isn't even labeled as to SAE grade. Of the JASO-MA oils on the market, only Castrol RS R4 is available in 5W-40, and it is not available around here. I can't even order it through local suppliers of Castrol. The lack of a 5W-40 is my biggest problem with the Mobil-1. Not being able to find an oil which meets the BRP spec creates a problem for me, and not one that I have a comfortable solution for as yet.