I DON'T like using 10-40 in the Florida summers, especially during stop & go city traffic during rallys.
I am CERTAIN I used Mobil 4T, 15(20?)-50 the first time I changed oil, then had to settle for 10-40 the last time, cause I couldn't find the other.
Now the last thread I've read here concerning Mobil 1, they don't, and appearently never did, make 15(20?)-50 4T?!?
Am I really getting to that stage of life!?
