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440rider18
02-13-2006, 08:37 PM
do you think that i should use a sythetic or just regular oil i just got done rebuilding the top end

boondockman
02-13-2006, 09:23 PM
Use regular oil,synthetic will mess up your clutch.

NCexRider
02-14-2006, 06:43 AM
http://www.exriders.com/vbb/showthread.php?s=&threadid=209274

coryatver
02-14-2006, 07:11 AM
synthetic! dino oil burns out in no time on a 400ex

Krazy KFX
02-14-2006, 10:02 AM
Use regular oil,synthetic will mess up your clutch

Synthetic will not mess up your clutch. I've been using nothing but for 2yrs with no problems