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Old March 18th, 2006, 11:15   #25
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Join Date: Oct 2003
Location: Roanoke, VA
Fuel Economy: 28mpg@74mph: 1995 Volvo 850 Turbo Wagon

So then, if it is a straight 75 (not even a 90) it would be thick like molasses at 0c, or so.
No. The SAE using seperate and arbitrary systems for classifying gear oil and motor oil viscosities makes this confusing though...

75w-90 roughly equates to 10w40

in motor oils, G52 may be a straight 10. or using multigrade terminology, a 10w-10. SAE 10 when cold, SAE 10 when hot - meaning it does thin when hot but as expected for a SAE 10 oil.

this is part of the confusion with SAEs arbitrary viscosity numbers.

don't take my word on this - buy a liter of G52 and a liter of your favorite 75w-90. stick samples of them both in the freezer and see a) if G52 becomes syrup and b) which sample appears / feels thinner or seems to flow more readily.

here's some more info on relative viscosities: link
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Last edited by SUNRG; March 18th, 2006 at 11:25.
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