What is "Plan B" if I can't get Amsoil Z-Rod for My 1990 Corvette ZR-1.

[Jetronic]

if they did, who cares? Oils are can only be assessed based on the performance of the full formula.

You can't judge a pie from the quality of the lard in the crust. You judge a pie by eating it.

And by how it adds to clogging arteries.....

 

[robertcope]

Not an easy oil to find in Canada.

M1 0W-40 is easy, plentiful and cheap in Canada at Canadian Tire.

I'd run M1 FS 0W-40 in a heartbeat. I may switch to that next time, because it's in most of my other cars already. I just thought Supercar sounded cool! And it is the Corvette oil.

 

[ZeeOSix]

And by how it adds to clogging arteries.....

Human "oiling system sludge".