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I agree, the drag of too much and very thick grease creates friction and heat by itself. I don't recommend thick stuff in the bearings. This will cause galling of the races and cause the balls to skid rather than roll. Then the ball cages fail and let go and blow out the seal(s). I'm sure we all know what that looks like. Thin WP synthetic grease filling only 1/3 of the bearings cavity is best. Then spin them up by hand or drill to spread it out before installing. My bearings last the longest when I do this. Even when new, I clean out and replace factory lube this way. I've inspected new bearings only to find some of them dry as a bone. Can with most brand bearings. If you don't check them, you will wonder why you had a bearing fail very early on. Been there.Don't pack too much in your diff or rc bearings as grease holds heat very well.
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