OD lube attracts dirt......Sullivan dry ice is a little better but not much.......Grease DEFINATLY not......Dry graphite powder cant stick......THE only product ive found to help wear on Bones and CVD's is a Dry Film lube.....Super Lube is the brand i use which is made by Synco Chemicals corp....and it dry's 100%....neither OD or Sullivan can claim that...they leave a residue that Does attract dirt...and as hobbipro said...the dirt is Highly abrasive and WILL shorten the life of that bone or Outdrive.