I run AMSOIL: sae-60, 20w-50, even 10w-40. . .i takes a darn cold winter before go to 10w-40. . .

My ford has 15w-50 Mobile one in it right now we hit the 20's at night starts just fine. . .

My GMC runs straight 60 year round start's all winter with just a tap of the key. . .

Mike !


1962 GMC K3000, GMC-379 V6.