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www.amsoil.com has a SAE 10w-40 motorcycle oil that you can run in your primary. You can also look @ www.bel-ray.com. They have a V Twin conversion guide that has all their products listed. You can also check out www.redlineoil.com. I believe they recommend their MTL. I was told that the 'top secret' motor co. primary fluid is plain old SAE 5W-30 refined by Shell or Sunoco.
One thing to keep in mind is that there are quite a few standards used to grade oils, lubes etc. For example, a 75W-90 gear lube has nearly the same viscosity as SAE 10w-40 motor oil. That's not to say that you should substitute one for the other. You should just be aware of the differences when choosing oils and the like so you don't get hosed by all the marketing hype.
One thing to keep in mind is that there are quite a few standards used to grade oils, lubes etc. For example, a 75W-90 gear lube has nearly the same viscosity as SAE 10w-40 motor oil. That's not to say that you should substitute one for the other. You should just be aware of the differences when choosing oils and the like so you don't get hosed by all the marketing hype.
