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I am starting to think that these engines really like thicker oils, at any operating temps of 70f or higher.
Have any of you tried running a straight 50wt or 60wt oil? I know alot of dirt bike guys run Rotella 15w40 due to its high zinc content which seems to deaden sounds from the engine. I do not know of anybody running a Diesel oil in their Harleys though.
Thoughts? Experiences? I am all ears.
Last edited by parts eeter; May 12, 2013 at 09:22 PM.
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