Agree completely. Any oil you can buy today is 1000 times better than oils of the 1920's - 1930's. ZDDP was first used as an oil additive in the mid - 1950's because of higher valve spring pressures causing premature failure of cast iron camshafts and cast iron lifters. It was never used in the Model A era and never needed due to low valve spring pressure and low RPM.
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Originally Posted by Humperhill
I agree, if so many people are using so many different grades with positive results then I think what you use is less important than keep the level up and keeping it clean. No comparisons to today's oils to oil available 90 years ago
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