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3 hours a week? My suggestion then would be every two weeks, although I've often run my buggy and truggy for probably 5 hours a day for three days, and neglected them for a good month. Dirty? A bit. Damaged or otherwise hurt? Negatory ghost rider.
Thanks for the advice. The Mugen buggy is a blast! It goes around the track like a spider, very responsive. I have a P5 powering it, Hitec servos and I added a M2sec Ackerman and 2mm offset hubs. Some DE skid plates, JConcepts wing and I am happy. The buggy has taken some nasty spills with no breakage or slippage. It's plenty durable. I like wrenching and I know the dogbones wear and the outdrives, and those bearings can go.There is no 'interval' to service them. I'm basing this on the fact I've had vehicles go gallons without servicing and when I cracked them open it was as good as new. I am constantly testing out diff setups so probably rebuilt/built 70-100 diffs over the past six months (not 'bragging' just stating facts). The items surrounding the differential (bearings/outdrives/housings/bulkheads/inserts/mounts, etc.) are what need servicing.
I have the MBX6r (which I believe use the exact same diffs). I've yet to have any leakage problem I can recall with them. Just like shocks....if they are built right you don't need a set interval per se' like bearings, clutch shoes, etc. If you have no desire to test different setups then I'd say after 1-2 gallons check the items I listed above.
Every diff is different as well. When you go through it, look for wear on any things such as washers under sungears, the backside of pinions and what-not. If you build a new diff, I've found it's best to set it really tight. It will sound like crap at first but it will properly seat itself. AE Green Slime is probably the best sealant I've found as well.
On a separate note..how are you liking that MBX7? Not many Mugen guys on here...those are some durable machines, eh? ;-)