I know this is probably a pretty common question but which oils and coolants do you use??? I am doing a total rebuild on a 98 WR 400. I hear people say, "use synthetic" and others say "do not use synthetic" I am running a new OEM clutch set up. Can I use synthetic with it? On the coolant, I am running new fluidyne radiators, and will be riding it on the streets. Would engine ice be good, or which coolant should I use? Thanks.