Originally Posted by wscott

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Here's what i use that's specifically designed & formulated for HD 6spd and Primary too.

Scott

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http://performanceoilstore.com/products.asp?cat=65&pg=4

Spectro Heavy Duty Platinum 6-speed Transmission Oil 1-qt. Enter quantity of 12 for case discount. Designed by Spectro in response to complaints from Harley owners about the great but noisy new 6-speed transmission, this full synthetic provides ultimate lubrication protection. Formulated to significantly reduce gear noise and provide easier, smoother shifting, this SAE 75w140 formulation eases shifting even when cold. High loads and extreme heat do not affect the oil, so it performs well when pushed hard and long. A.P.I. GL-5 rated
List Price: $19.60
Price: $15.85

http://performanceoilstore.com/products.asp?cat=65&pg=4

Spectro Heavy Duty Primary Chaincase Oil 1-qt. This sheer stable petroleum is designed to withstand the punishment of high loads, and contains special polymers to provide exceptional clutch engagement and temperature stability. Meets full OEM requirements, and should be used according to manufacturers’ instructions. Formulated specifically for Harley® Sportster and Big Twin applications. Low drag, low friction loss SAE 85w viscosity helps eliminate clutch “drag” and slipping.
List Price: $12.04
Price: $7.95

Originally Posted by TheMurf

Spectro 6-Speed tranny oil for me.Made for Harley 6-speeds.

Red line transmission oil with shock proof is good stuff too..

Originally Posted by Nobudy

Additives for clutch ... thought we were talking gear oil for transmissions on big twin bikes,?? I would like to see you put the clutch in the transmission though yah might learn something tryin sorry couldn't resist lol..... Ok.. clutch is in the



Originally Posted by northwestern

yeah, he quite literally posted "and primary too" in his reply 7 years ago, right at the beginning.