What Primary Oil is your Choice

[OldFenderGuy]

What do you guys think of using Rotella T 15W-40 non-synthetic in the primary? Friend of mine gave me a case of Rotella, and I'd hate to see it go to waste. BTW, I run Mobil V-Twin 20W-50 in the crank and Mobil 75W-90 in the tranny.

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[a21m]

I just switched to shell rotella t 15w40 in the crankcase and primary. no problems that i can tell. everything seems to work fine. i put belray in the trans, but will probably switch to a 75w90 next fluid change.

[Spectrexx]

I use whatever is on sale at Walmart or Autozone. 10W-40 works fine for me in temps of 10 deg. to 90 deg. F.

[1FLTRI4ME]

Where do you buy the M1 V-twin oil at?


I think I would use a 4-stroke motorcycle oil that can be used with a clutch in the primary.I have some Motul 20-50,think Ill give that a try.

[goodbirds]

Switched from Syn3 to HD Formula+ in the transmission and primary chain case. First impression is that the tranny shifts smoother/easier. This on recommendation from Zion's ace tech with 28 years experience. The occasion of the oil change was a leak around the shifter shaft and replacing all seals while we were in there. Is it possible the systhetic damaged the seals? Just wondering. The Ultra has 40,000 on it, always maintained by HD.[:@]

[55Bubba]

While we're talking oil, I'm having a wrist pin put in my rear cylinder. My mechanic swears it's because the previous owner and therefore on the PO's recommendation, I ran Castrol 20w50 . He says regular oil is not made to put up with the heat especially here in the south. The previous owner had a crate engine put in 20k ago because it developed a wrist pin problem and the dealer forgot to put the keeper in when he rebuilt the top ends. Two engines, two wrist pins. Now understand the previous owner changes religously at 2500 miles, uses Fram filters and never fails to keep up with maintennance. His other bike 97 RK has 170k on it and still running strong.

Did the auto oil cause the wrist pin problems? I dunno, but I know when I get it back, if there ain't synthetic in the crankcase, there soon will be. Probably Mobil1 V Twin and Mobil 1 75-90 in the tranny. Not sure what in the primary, maybe HD formula +

Ride safe

Bubba

[skulboy]

i've been using mobil 1 atf, no clutch drag or slip, haven't had to adjust the clutch outta necessaty, just regular intervals. also noticed less shavings on the magnet!

[Honus]

Chevron Delo, Shell Rotella and Mobil Delvac 15W-40s wook great in the primary.

[glide]

I use the formula + but I also have the older primary oil which was discontinued .

[FLSTC]

AMSOIL 20W50, no problems yet