Rotella 15-40 in Harley engines

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Feb 17, 2007 | 04:36 PM

#11

Hogaholic

Outstanding HDF Member

Joined: Aug 2006

Posts: 2,613

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From: Virginia

RE: Rotella 15-40 in Harley engines

I use the rottela 5w-40 synthetic in my race atvs and all lawn equipment and my f250 diesel of course. Make a huge difference in starting ability in cold weather vs. the 15-40 non-sys rottela. I have not used it in the bike though. Ill pay the extra for mobil v-twin and change it every 5000. This oil was designed especially for the harley and mobil one has a bullet proof reputaion.

Feb 17, 2007 | 06:39 PM

#12

KBFXDLI

Big Kahuna HDF Member

Joined: Feb 2006

Posts: 23,881

Likes: 34

From: USA

RE: Rotella 15-40 in Harley engines

Quote:

ORIGINAL: OneBlackFly

What is the specific reason not to use either of these oils in the primary? To my knowledge, Rotella does not contain any fricition modifiers to affect the clutch (don't know about Havoline). Elaborate on your reason please. Thanks.

I just like a thinner synthetic oil in the primary so the clutch doesn't drag when it is cold. Redline MTL seems to be about the best because it pours like a 5 or 10 w oil when cold. And where I live it is cold most of the time.