sugafree Why run 30 weight instead of say 10k? Does the thicker oil make the diff work more like a "locker"? or does it just wear on the case less with thicker oil The reason is all I do is bash as well and I was about to replace the stock grease with traxxas 10 weight. Also, how much oil do you put in. Do you fill the case or just put in enough to lube the gears. Lastly is there a particular brand you recommend?