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That is because SG is obsolete. Use the Red Line oil of the right viscosity if you want to use RL. The new ratings supersede the old ones.
Sorry, but I respectfully disagree. Oh, sure, I agree that new ratings supersede the old, but SM for instance doesn't have nearly as much ZDDP as SG. Flat tappet engines *need* ZDDP. That is the reason new engines have roller cams. ZDDP doesn't play well with catalytic converters, so it has been (mostly) removed in newer formulations. Ahh, oil threads.. you gotta love em..
I just ride till the oil light come on then I add, and if in the mood, I change the oil.....
One of my Moto Guzzi owner's manuals recommends Castrol products, and 10W60. The Porsche guys really like this oil. I realize that's German, so you may want to add an eye-dropper of olive oil (extra virgin if you got it) to each quart, if you're planning to put this in your Goose.
Personally I like to blend my own because I obviously know what the best oil type/weight for something they manufacture. I use 3 jiggers of 0W-5, a splash if 15W-40 and 2 fingers of 10W-60 to create the perfect blends of 11-33/64W-56. After doing tons of research (well actually read a couple oil threads) I determined this is the perfect oil weight.I also use a blend of conventional, semi-synthetic and synthetic to get a semi-conventional oil.
WHAT?!?! 3 jiggers of 0W-5?!?! You, sir, are off the rails!