Does this Syn 15W-40 shear less than the 5W-40 in your bike?
I've always run regular T-4 with great results.
I have. At least when going from cheap dino oil to a premium synthetic.I have never found a difference in gas mileage with changing oils.
Its hard to find the 5W40 even in part stores around here.I purchased 6 gallons before the ridiculous Biden-Shortages. Since, I haven't seen a single gallon in either of my WallyWorlds. Of course, haven't seen the 5w40 either. Just plenty of SuperTech 15w40. Of course I could go to any of the auto parts stores and pay $35 a gallon for it.
I agree with most that the T6 15w40 is about the best motorcycle oil out there.
And yes, T6, 5w40 shears too quickly in a shared sump for my flavor.
People advise between 5w and 15w but W is not a grade test nor is a
shear stable test... W is a Cold Crank Simulator test to assess the
low temp performance... low temp is any degree number below operating
temp or 212F... The lower the W number better the flow performance
during critical start up before warm up... CCS test is important
against wear because roughly 60% of total engine wear occurs during
start up before warm up conditions while you wait for the oil to circulate
through the engine...
Did you get that Jello analogy from Tom NJ???The oil pump can pump jello, but jello could not be picked up through the pickup tube, so the pump would cavitate. That’s the whole point behind these ratings, not which oil flows better.
Its indeed a Tom NJ quote dated Feb 4 2015 in a thread where you had CCS questions: