The Beginners Guide To Oil | How It Works | Motorcycle Cruiser
I have been using Rotella T-6 5w40 Jaso Ma approved for years in many different water boxes. I bet the new Africa twin crossing the Sahara is not using a 10w30.
I am not an advocate of Rotella, but I can use the same oil in my tractor, mowers, trucks and 4 motorcycles, without having to stock 10 different oils and it readily available @ Wallyworld.
That was a good article, but I don't see how you got that it was okay to use something other than the manufacturer's recommendation out of it.
Times, they are a changin'. Modern engineering and manufacturing to tighter tolerances call for different lubrication recommendations from the manufacturers than the "old standards". There is a little too much "that'll do" attitude around these days for my liking. There is a big difference between an older air cooled engine design and newer water cooled motors.
Really? The 40 wt. properties will act exactly the same at operating temperatures as the 30 wt. in that brand new machine? Hmm, what about the 10W-50? At what point does it start to matter?? Yeah, that thicker oil might make it seem to "shift smoother" and you may not "notice any damage"...yet. Engine damage usually compounds and is seen later on. Feel good about that "thicker" oil lubricating all of the nooks and crannies properly, well it's your bike I guess. I think I'll stick with what the engine was designed for.
Look, the best thing that you can do is use an SAE 10W-30 motorcycle oil meeting JASO T 903 standard MA, conventional or synthetic, and change it at or before the recommended service intervals. I think that it's better for your engine to change the oil more often, than to try to find the "magic oil" to put in it.
Check out this video where ericthecarguy speaks with representatives at Valvoline. The whole thing is a good watch, but @ 6:12-12:16 they speak to this issue of viscosity. Or, if you are super short on time, start at 10:20.