'SAE' is an acronym for: "Society of Automotive Engineers" An international non-profit educational and scientific organization dedicated to advancing mobility technology.
They develop technical information on all forms of self-propelled vehicles including aircraft and disseminate this information through many channels, including oil specifications.
The number "90" is the viscosity (or thickness). 90 being a very viscous or thick "weight" oil. (90 weight would obviously be for special applications.)
"Straight" (or single), means that the viscosity is rated at a single non-winter temperature viscosity. Usually, the weight will include a "W" for "Winter" (as in 10W-30), rating that viscosity at 0 (zero) º degrees F.
And of course "mineral" is just that.... mineral oil ... Petroleum distillate.
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20W-50 is equal to Sae 90 W.
Manual says to use SAE 75w-90 or SAE 80w-90 gear oil
SAE 90
sae 90 gear oil. it is 100% mineral oil. napa, car quest, call your local massey dealer they have it. you will pay a little more but they have all the answers.
Yes, you can use 75w-90 gear oil instead of SAE 90 gear oil
sae 90
Sae 75w/90
SAE 80 or SAE 80w-90 below 50 f SAE 90 or SAE 80w-90 0 to 90 f SAE 140 above 50 f consistently
Sae 80w-90 gl-5
The cross reference for m-4864 which is a hydraulic oil or transmission fluid is SAE 80 for below freezing temperatures. B (SAE 90) is used for temperatures that are above freezing.
SAE 75W-90
Do not use the oil instructed below.... 10w-30 is fine for mild climates. SAE 75W-90