I run 2.0 buggy and truggy and I like to rebuild the diffs and shocks every gallon. I always replacethe bearings on the diffs when I rebuild them and usually don't change the o rings in the shocks until I see the shock wet and leaking. I am using $1 avid revolution bearings on everything but the clutch. At $1 tossing them is no big deal. I can't say I notice my shocks losing oil but maybe they are idk.