Okay. I have read through many posts about oil selections etc. Decided to use Mobil 1 V twin in motor and Mobil 1 75-90 in transmission. However, I am not sure what to use in the primary. Glider, in a post someplace you said “In the primary pretty much any 10/30 - 10/40 without friction modifiers in it will do the job.” I understand why it should be without friction modifiers – though if you use for instance Mobil 1 V twin doesn’t that use the modifiers? Can you give me some examples of brands that do not have friction modifiers, cause I don’t think it says so on the bottles, or does it? Thanks for any information you can give me.