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I don't want to bust your bubble, but there are differences between Diesel oil and Motorcycle specific oils. Some of the differences are very small and some are fairly significant. It all depends on how you look at it.

Also Shell RotellaT Synthetic oils are actually Group 3 Petroleum oils. Even thought it says Synthetic it is oil refined from petroleum crude oil. Basically any oil you buy that costs less than $6.00 to $6.50 a quart is probably Group 3 petroleum oil that is being marketed as synthetic oil. Castrol started this in the mid 90's, Mobil 1 sued Castrol and lost and within a couple of years Mobil 1 reformulated using Group 3 oils. This forces most of the other major oil companies to do the same to stay price competitive.

Mobil 1 racing and motorcycle oils I believe are still Group 4 or Group 5 synthetic oils, which accounts for the much higher price.

Tom