Question about 1979 Harley Davidson XLS 1000

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Transmission oil weight recommended for a 1981 1000 harley davidson sportser iron head

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All Harley recommends is their Transmission and Primary Lubricant for Sportsters. Now, what weight it is or any additives for the clutch that may be in it is Harley's secret. Also, the "viscosity" rating for gear lube and engine oils are different and I'm not sure how they relate to each other. I've seen advertisements for a 75W90 lubricant for V-Twin transmissions but I'm not sure if that works for the Sportster since the transmission and the primary (which includes the clutch) are lubricated by the same lubricant.

I would think that you would want a lubricant that would have a "high pressure additive" or "anti-shear" additive in it. When you look on the container, you'll see an API code in a round circle. Most of todays oil only carry one rating for use in gasoline engines. Usually it's as "SH" or "SJ". You need an oil that is rated for use in diesel engines to get the additives that I've just talked about. The rating on the container will read something like "SH/CG4", the CG4 rating being for diesel engine use.

Unless you are in an area where the availability of oils is limited, I'd opt for the H-D oil or one of the oils packaged by someone like "Motor Factory" or "Revco". You may find a recommendation by going to some of the oil companies like Shell, Mobil, or Sunoco.

Good Luck

Posted on Jul 29, 2010


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