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I don't have any servicing history YET in the M8 versions but for my twin cam versions, I used a good typical 10W-40 (non-energy conserving) in the primary. I found that and good precise clutch adjustment made neutral not quite so elusive.
Don't know what you're calling premium oil, but like said in another thread, I've tried a lot of different primary oils and in the end the one that works best is the standard Harley primary/transmission oil. It's like a thin silky honey. It shifts smoother and it helps with neutral. As with any oil switch, you have to run it or a while to get the benefit and it wouldn't hurt to drain and replace after about 1000 miles to get the remnants of the previous oil out..
Hello, Im not at home to see what kind I bought but doesn't Harley have a Vance and Hines oil. I walked into the store to change the oil on the whole bike and that is what they recommended. Now that I think about it I dont think I told them I was doing the primary cover? Is that as issue? Thanks
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