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Originally Posted by 40 Deluxe
P.S. Note the lubrication warning in large print on the last page.
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What advice can I get regarding oil for my R10 overdrive? The repair manual recommends SAE 40 engine oil or straight SAE 80 mineral oil. Randy Rundle recommends non-synthetic 80/90 gear lubricants. I purchased a gallon of 80/90 GL-5 extreme pressure gear oil because that is all I could find locally but there seems to be some debate over whether GL-5 oil will destroy yellow metals. Some say that modern GL-5 is safe to use and won't hurt. I've hesitated in using this oil and wonder if I should return the oil to the store and try to find GL-4. Any wisdom to share? What are people using?