Did a test at a quarry i was Superintendent at . Two NEW 250HP, 1750 RPM virtical turban pumps Moters. One Moble Red Synthetic other Dryden Oil bulk molly. Pumps Ran 16hrs a day , 6 day a week. After 4 yrs No Difference. Grease at Manufactures Recommended Intervals, Dont over grease & Buy A...