Hi Cook,
i have the same basic bike. I run Red Line Shock Proof gear oil in the tranny and Shell Rotella-T 15W-40 in the primary and that really smoothed things out. I change the gear oil every 2-years and the primary fluid every year regardless of miles. I think the clutch contaminates primary oil quickly. I think the biggest improvement came with replacing the stock primary chain tensioner with the HB-125 hydraulic tensioner. The Harley shifts like my dirt bike and I never have a problem finding neutral like a lot of guys with new bikes do. Clunking is also reduced.

 

Just a update on what i did. I put 20w50 in the motor and primary. In the trans i put amsoil severe gear 75-110. It did quiet 5th gear whine a bit and it doesnt clunk as hard shifting into first. As well as neutral is easer to find

 

I put red line shock proof in my snowmobile chain case today, because of being happy with the results in the Harley transmission. Primary on HD waiting for spring to get the redline primary that's setting on the shelf.

 

yeah, m1 20w-50 in the engine and tranny....redline for the chain......

 

Since the primary has clutch friction disks the fluid should meet the newer JASO MA standard. I have found few motor oils meet this standard. I like the Amsoil 10W-40 motorcycle oil, and Mobil 1 10W-40 motorcycle oil which meets this standard. As long as it meets this JASO MA standard it will work.

 

mechanic once said, primary oil is a bathe oil....you could **** in the primary and get the same results......I'm experiencing smooth shifts with the redline.

 

Same here. I use Red Line MTL, also named V-Twin Primary Case Oil. Works great.

 

My oil wasn't changed in a long time,(previous owner)......but the primary oil and transmission oil change greatly improved the shifting and running in general of said cycle. Never could wrap my head around why someone would neglect a bike like that.

 

I just did the Mobil 1 V-Twin "in all 3 holes" scenario on my 2013 Wide Glide 103. I think it might shift slightly smoother, but overall no major differences. Finding neutral seems to be a little better now too, but it may be in my head. Absolutely no adverse reactions as of yet. Full synthetic gives me piece of mind and DIY is pretty cheap when buying it from Walmart.

 

I run 30wt non detergent store brand as long as it still has API label on it. The purpose is to lube the chain, sprockets and clutch. Anything else is over kill.