RE: What a difference gear oil can make?
Motor oil and gear oils are not created equal for example the 85W-140 viscosity gear oil is roughly the equivalent to a 20W-50 motor oil consequently the use of an 85W-140 gear oil will not result in a viscosity conflict. The polymers added to make multi viscosity oils prevent the oil from thinning as much as it warms up and do not add any additional viscosity when they are cold.
"At cold temperatures the polymers are coiled up and allow the oil to flow as their low numbers indicate. As the oil warms up the polymers begin to unwind into long chains that prevent the oil from thinning as much as it normally would. The result is that at 100 degrees C the oil has thinned only as much as the higher viscosity number indicates. Another way of looking at multi-vis oils is to think of a 20W-50 (85W-140)as a 20 (85) weight oil that will not thin more than a 50 (140) weight would when hot."
Hope this helps,
FBL
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