Originally Posted by TheWorstDriver

Seriously though...
Car bearings:
Keep in mind the cleaning process of your car. Using things like a WD-40 baths and air compressors will push debris into bearings and shorten the life of the bearing. You don't need to be a pro driver to understand this. I've run Losi, Mugen, Kyosho, Xray, and Avid bearings, I destroyed all of them with WD-40 and an air compressor. Later,.. I learned like everyone else eventually does that's BAD. lol. I use a dry brush for the main dirt, a light spray of simple green & with a rag, and a final touch of SC1 so dirt doesn't stick the next time. I avoid blowing wet cleaners and solvents into the bearings when dirt is present. I mostly ran Avid bearings and keep my stock ones as a backup, or run them only on the practice car. Replace as needed, but replacing in sets does help keep track of bearing life in certain parts of the car. For example: if a left rear wheel bearing is gritty and near failure, change both the left and right in a pair. If you do this you should have equal rotational resistance on both sides of the car if that matters to you. Admittedly, and from experience, most my bearing failures are self inflicted due to to improper cleaning.

Clutch bearings:
I run in multiple sets of bearings in during engine break-in, wipe them off, and set them aside for later use. When idling for break-in the excess grease comes out and leaves only whats needed a thin film. I now use the TKO in the race car, and Avid in the practice car.

If this was a 1/10th scale thread, cleaning your bearings and oiling them often might be the ticket. However this is 1/8th scale baby,.. run'em, hard, and have fun, dont spend your life oiling every bearing. This is only my opinion, but it was formed many years ago.

Cheers!