Reply To: Oil mix

[kerry]

Ratios are not about the quality of the oil but the quantity. Keep in mind the quality of machinery back when your particular motor was built. In the 1930’s, tolerences were pretty loose because the machinery was primitive by today’s standards. Lots of oil helped fill in the clearances. Things got a bit better machinery wise post WW2, and ratios thinned as tolerences got tighter when more accurate machinery was created.. Nowadays, CNC machinery is the norm, tolerences are measured in ten thousandths not thousandths, and thinner oils in smaller doses are used. You can take your chances with less oil if you choose, its your motor. Personally, I’m with Tubs, using full synthetic until my last half gallon of Pennz runs out, then will search for a replacement. I mix at mfrs ratio and add a splash of Seafoam to keep things cleaner inside. As the elders say, oil is cheaper than parts. I agree.

If you have too many, AND not enough, you're a collector.