I've been using Chevron Delo #2 (Blue) grease to pack wheel bearings on the motorcycle for about 15 years now, and seeing better bearing life than any other grease that I have used. By the time the tire is worn enough to change, the grease is black and thinned out, but the appearance of the bearing suggests that it is still working.
What makes the grease go from blue to black? Is the color change in any way indicative of a change in the lubricating properties?
What makes the grease go from blue to black? Is the color change in any way indicative of a change in the lubricating properties?