Re: SpeediFour and SpeediTwin oil ratio?

[Randy in Tampa]

I can’t readily find penzoil full synthetic, I have been running amsoil synthetic 30:1 (shhhh) in my PO15 and prewar Johnson’s including ERV Johnson’s "after breaking in" with no issue and when I run in test my tank after a week the oil slick is gone, my 2cents 😉