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Primary oil

Howdy all, I contacted mobil 1 on their web site. They advise using the MX4T 10w40 oil for the primary because it has no friction modifiers. I have not yet put it in the bike, but I'll do so this weekend. I will let you know how it works after a month or so. I am somewhat hesitant to use the gear oil in my primary. I use it in the tranny, but it sure feels thick to me for the primary. But what do I know?? Not much about oils.
adios,,
 
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