gsxr,

I was a trucker before I got into medicine (logical transition, right?!) and did a study years ago on engine oils. Conclusion was that Shell Rotella T 15W-40 is the flat-out best stuff out there, period, end-of-discussion, thank you, goodbye!

Seriously, my study did not include synthetics, that's all. I guess I'm just an old fashioned sort of guy, what can I say? That, plus I've still got a drum and a half of Rotella T sitting in my garage.

Someday I'll probably do another study and just might switch to synthetics. In the meantime I'll stick with the tried and true (and paid-for!). Ha!