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Re: Re: Re: The full story on transmission/hydraulic fluid for use in N series tractors
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Posted by Nolan on March 30, 2000 at 07:10:16 from (209.48.190.195):
In Reply to: Re: Re: The full story on transmission/hydraulic fluid for use in N series tractors posted by llamas on March 30, 2000 at 06:55:45:
SAE viscosity indexes are different for gear oil vs engine oils. And as I recall, a 50 weight engine oil is of aproximately the same viscosity as an 80 weight gear oil. Jumping forward to current manual transmissions, many of the manufacturers are specifying motor oils or even ATF for their transmissions. This can, and does, work; provided the owner is rigorous in changing the transmission oil on schedule. Something most people do not do. It reduces drag, increasing fuel economy. With many of the tiny cars, the loss of EP lubrication is not a significant issue; again, provided the oil change intervals are adhered to without fail. Most motorcycles lubricate their transmissions with engine oil btw, and have for many decades. Taking that and jumping backwards, the knowledge of the basic oil similarities existed in the 1940's. If there was a problem with the availability of the typically specified gear oil at that time (wasn't around then, don't know), Ford may have been officially acknowleding a make due alternative oil. Though why it was listed first, and not as a poor second choice, I do not know. Alternatively, it may well have also been to do with an error of engineering understanding by a marketing type or such that was later corrected. I do not know, just rumenating on the subject.
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