Re: Oil viscosity (weight) for model A
1930-Pickup, thanks for posting an informative link.
Not much doubt that a 'modern' multi-weight oil is the best but no one provides at what engine temperature does this magic transformation take place. I suspect to get the full advantage of a multi-weight oil it is necessary to also use a modern thermostat in your Model A.
For your consideration, 20 years ago I called the Pennzoil consumer hot line and asked for their suggestion. " With the clearances in an engine that old" they suggested a straight 30w.
Since then I've tried all the combinations.
My '28 does not have a thermostat and since the thrill of driving in sub-freezing weather no longer excites me, I've returned to Pennzoil's suggestion.
'Your mileage may differ.......'
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