No it is not. 10w/30 engine oil is approximately the same specific
viscosity as 75w/80.
Please do not post speculation as fact. It only serves to confuse.
Please check your facts before posting in such a deffinite manner.
Quality standards used above are those set by a trade body called the
Viscosity standards are however expressed in terms of different scales
for transmission and engine oils and these are governed by the SAE.
It doesn't take a brain surgeon to check that these are the facts. For
instance, and because their products appear to be held in high regard,
this is a section copied from their web site:-
MTL® Manual Transmission Lubricant
a 70W80 GL-4 gear oil (SAE 5W30/10W30 engine oil viscosity) designed
for use in manual transmissions and transaxles. Provides excellent
protection of gears and synchronizers and its balanced slipperiness
provides a perfect coefficient of friction, allowing easier shifting.
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