I have 8100miles on my 09 M8 with stock engine, no rebuild. At 4500miles, this sled is new!

LOL seriously, major issues is
-Change your DD oil every 800miles (DD oil worn very fast)(check at 4500miles, open your DD and check your bearings and gears, at 5800miles on my sled, a brass shim get out, no major issue but if you dont check frequently...$$$)
-Check and probably change your mag engine mount every 1000-1500miles (put M7 torque arm for help to prevent this issue)... on my sled, i make a add 2 custom mount + m7 torque arm
-New Secondary clutch bushing every 1500miles,.. (send it at M&M Sport Center he put a steel hub and brass bushing) on my sled i put STM 10.4 secondary clutch, all parts is serviceable
-New Primary clutch rollers every 2000 miles..(use old rebuild kit from old cat clutch) on my sled i put P-85 from FTX, all parts is serviceable from Polaris.
-Send your shock at GSR in Idaho for revalving and rebuilt. After two riding seasons, send your shock for oil change, Float oil worn very fast!
It's major wear issues i noticed on my sled and many M sleds here.