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1954 flathead motor oil


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1 hour ago, pontiac1953 said:

pontiac said straight 30 weight in warm weather, straight 20 weight in cold weather.

 

Many manufacturers made this same recommendation, but multi-weight oil wasn't available or in wide use if available back then.

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On 9/8/2021 at 1:19 PM, JFranklin said:

Many manufacturers made this same recommendation, but multi-weight oil wasn't available or in wide use if available back then.

well multi grade motor oils are rated that they behave like the higher weight under controlled lab conditions, such as 10-30 or 15-40, not the same conditions in real life driving, granted the motor oils today have far better anti wear and detergent additives vs the single weight oils 70 plus years ago. Pontiac straight 8 and straight 6 are rugged, low rpm engines with solid lifters and full pressure lubrication, i stand by what Pontiac recommended then has for what oil weight to use in their engines.

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When I was a kid I saw a display in the Los Angeles Museum of Science of single vs Muti-weight oil. Four 8 foot clear tubes on a teeter totter type device that held a tennis ball size steel ball in oil. 30 weight cold, 30 hot, 10-30 cold and 10-30 hot. You could see the ball fall through the oils and make a comparison. I use multi weight oil.

Edited by JFranklin (see edit history)
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