Gear lubricants are often referred to as grease; however, this is technically incorrect because gear lubricants more closely resemble motor oils than grease. Another common misconception is that gear lubricants are thicker than motor oil, which is usually untrue.
SAE gear lubricant grade numbers are larger than SAE motor oil grades; however, this does not mean they are necessarily thicker than motor oils. Gear lubricant grades are determined on a different grading scale than motor oils. Rather than use the same classification guidelines, two separate grading systems were developed to minimize confusion between SAE gear oil and motor oil grades.
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