Looking for Oil brand and grade recommendations for a '65' Mustang with a 289 High Performance. Car has a mild cam in it. I was thinking of going with the Valvoline VR1 series due to the higher content of Zinc but don't know if I should use a 20W50 or like a 10W40 or even 10W30 grade. This is my first classic car ive owned.
Thanks for your input
Thanks for your input