Ok, explain 0-50 Mobil One to me then. When it's cold it flows like it isn't there and when it's hot it gets all gooey?
jest kiddn' -- when its cold it flows like a zero weight oil (zero on a viscosity test flow meter scale that was set up a long time ago by automotive engineers when getting a 10 wasn't very durn likely)
And the flow rate of this oil doesn't change much at all, flowing like a dino 50 weight oil does when it gets all hot and loosey goosey.
I am a fan of synthetic oil, BTW. You have to get synthetic oils up to over 350 degrees F to even begin to hurt them.
I would think that any FULL synthetic 10w30, 10w40, 0w50, 15w50 would likely be sufficent to keep our scoots healthy winter or summer.
Why would a FULL synthetic 10w30 work in the summer time when Suzuki doesn't recommend the 10w30 weight when temperatures get much over the 90 degree range?
Because the rating was set for dino oils that change viscosity greatly as the temperature goes up. And FULL synthetics don't change their viscosity very much at all in any bike temperature range.
Mobil One was developed for lubricating jet engines -- which run up in the 400 degree ranges fairly commonly. And why do you think Mobil One is the only oil recommended for use in a turbocharger? Because they get right warm in normal use, that's why.