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Search: Posts Made By: rotorwrench
Forum: Model A (1928-31) 09-17-2021, 10:54 AM
Replies: 17
Views: 1,350
Posted By rotorwrench
Re: Wrong Gear Oil?

The Society of Automotive Engineers had different systems for grading viscosity standards between motor oil and gear lubricant products. SAE 50 motor oil is in the same viscosity range as SAE 90 gear...
Forum: Model A (1928-31) 09-16-2021, 11:04 AM
Replies: 17
Views: 1,350
Posted By rotorwrench
Re: Wrong Gear Oil?

I'll bet it takes a while to change out that STP viscosity builder product. Straight SAE 250 would be easier to change than that stuff.
Forum: Model A (1928-31) 09-15-2021, 03:26 PM
Replies: 17
Views: 1,350
Posted By rotorwrench
Re: Wrong Gear Oil?

The recommended lubricants are dictated by the manufacturer. Outdated lubricate grade ratings generally always have a modern equivalent. Seal technology back in the early automotive era was not as...
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