Logic and Lubrication
Even with all the separate oil compartments, Harley engines do not last any longer than any other brand of motorcycle with the similar size engine. Goldwings, Ventures, and BMWs regularly go over 100k if they are taken care of. And they all mix engine, clutch and trans oil.
And there was a study back in 95, on the effect of oil additives on the performance of wet friction clutch material. It found that the proper additives increased the wear of wet clutches. It was done at the Queensland University of Technology.
That being said, Sportsters have been around since 1957 but did not have wet clutches until around 1985. On those older bikes the metal the gears were made of were not near as durable as today's alloys, and the oil was much less sophisticated and no where as good as oils are today. Yet those gears worked just fine. Virtually any modern oil will work in the gears, not any oil will work properly in a wet clutch..
The clutch is the weak link in the motor. The engine and the trans with any decent oil will last a long time, probably through several clutches. Depending on what type of oil you use in the clutch and how fast you go through them.
But with the high quality of modern oils, unless you use really crappy "energy conserving" oil in the clutch, it probably won't make much difference.
Last edited by hig4s; Apr 14, 2011 at 08:56 PM.
Even with all the separate oil compartments, Harley engines do not last any longer than any other brand of motorcycle with the similar size engine. Goldwings, Ventures, and BMWs regularly go over 100k if they are taken care of. And they all mix engine, clutch and trans oil.
And there was a study back in 95, on the effect of oil additives on the performance of wet friction clutch material. It found that the proper additives increased the wear of wet clutches. It was done at the Queensland University of Technology.
That being said, Sportsters have been around since 1957 but did not have wet clutches until around 1985. On those older bikes the metal the gears were made of were not near as durable as today's alloys, and the oil was much less sophisticated and no where as good as oils are today. Yet those gears worked just fine. Virtually any modern oil will work in the gears, not any oil will work properly in a wet clutch..
The clutch is the weak link in the motor. The engine and the trans with any decent oil will last a long time, probably through several clutches. Depending on what type of oil you use in the clutch and how fast you go through them.
But with the high quality of modern oils, unless you use really crappy "energy conserving" oil in the clutch, it probably won't make much difference.
Even with all the separate oil compartments, Harley engines do not last any longer than any other brand of motorcycle with the similar size engine. Goldwings, Ventures, and BMWs regularly go over 100k if they are taken care of. And they all mix engine, clutch and trans oil.
And there was a study back in 95, on the effect of oil additives on the performance of wet friction clutch material. It found that the proper additives increased the wear of wet clutches. It was done at the Queensland University of Technology.
That being said, Sportsters have been around since 1957 but did not have wet clutches until around 1985. On those older bikes the metal the gears were made of were not near as durable as today's alloys, and the oil was much less sophisticated and no where as good as oils are today. Yet those gears worked just fine. Virtually any modern oil will work in the gears, not any oil will work properly in a wet clutch..
The clutch is the weak link in the motor. The engine and the trans with any decent oil will last a long time, probably through several clutches. Depending on what type of oil you use in the clutch and how fast you go through them.
But with the high quality of modern oils, unless you use really crappy "energy conserving" oil in the clutch, it probably won't make much difference.
Last edited by fat_tony; Apr 15, 2011 at 03:24 AM.
One Oil both holes or otherwise,,,,,,
Remember what I was Looking for In this thread.
NOT whats better but what SHIFTS better or the differences
I am looking for a difference In Feel, clutch action, gear shift sounds,
ease of speed shifts,,power matched down shifts.
Engine oil In the tranny versus Tranny fluids,,,
come on guys,,,stay with me here XD
The Best of Harley-Davidson for Lifelong Riders
One Oil both holes or otherwise,,,,,,
Remember what I was Looking for In this thread.
NOT whats better but what SHIFTS better or the differences
I am looking for a difference In Feel, clutch action, gear shift sounds,
ease of speed shifts,,power matched down shifts.
Engine oil In the tranny versus Tranny fluids,,,
come on guys,,,stay with me here XD
The win IMO goes to Gear oil.
Shifted very smooth, I thought maybe it was because of the new shaft. I could find N with no problems, from 1st or 2nd.
Changed over to Mobile1 gear oil. Doesn't shift as smooth. About 60% of the time shifting from 1st to 2nd, I end up in neutral.
I'll try formula1 next.





