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Originally Posted by Titan1958
Having a shared sump, seems like it's a really good idea to change often for viscosity-breakdown as well as clutch/transmission particle reasons. The HDEO 15-40's sure seem to hold viscosity well, and they are very inexpensive. If I currently had a separate sump engine, I'd run a synthetic in both engine and transmission, and THEN go for longer change intervals.
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Motorcycles that use one sump for everything such as metric bikes, operate fine with one oil doing the job for the clutch, tranny, and the crankcase. You would think that it would become contaminated more quickly, but experience proves otherwise. I have done a lot of testing over the last 25 years in all kinds of bikes by sending used oil to labs to see how it looks. I have had Goldwings run up to 25,000 miles on the same Amsoil with normal wear and the oil suitable for continued use. My testing has shown that most motorcycle oils do lose some of their viscosity through shearing forces and etc. though.
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