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I'm not so sure ambient air temperature has anything to do with the oil viscosity, except at startup. The bike is water cooled, and I guarantee that the average oil temp is right around 100 degrees C no matter what the temperature is outside, assuming the bike has had time to warm up. How hot...

Ok, so I chickened out. I went with a different set of logic. I bought Castrol Power RS Racing 4t 10w-40. My thinking was that I'll try the ultimate in motorcycle oil and see if I can feel a difference between it and the Rotella 15w-40 that was in my bike. Absolutely zero difference in shift...

Any idea if this oil would be a problem with a wet clutch bike, with its Ti friction modifier and all? I'm going to change my oil tonight with this oil and I'll find out. Get a uoa as well, but that won't be until Octoberish. I don't see any uoa's that use plain auto dino oil, just rotella...

Wow, even the HDEO's come out like water at 4k OCI? I just bought a Honda 599 that's gonna need an oil change soon. I wish a honda motorcycle powertrain engineer would answer a bunch of these questions.

I guess one way to look at it is, if the oem standards are so low, just use the cheapest oil that meets the requirements of non energy conserving API SG or higher. Waddayaknow, HDEO's!! Not only are they cheap but have been proven to show little wear. Is that the thinking around here?

It's been proven time and time again that the 5w-40 and 10w-40 oils quickly shear out of grade in a shared sump motorcycle engine. My question is, why would 10w-40 be the most common recommended oil weight by the manufacturer's? They must know that the 10w-40 grade shears, and yet they still...