we never clean them out,heck i work with jokers,they would pour in some more to be sure!!,,we drive them to burn them out,heehee,its fun,yea the thing is loaded inside the exhaust,,it was funnydriving itlike that,,musta caused a vacuum above 3000 rpms,and drew oil up thru the drain,,,cause i had the feed plugged toget home,,ihad to do about 55 or so all the way back,,any more,it would fog big time!!!,,,,,actually,imgonna go "burn 'er out " right now,except it sucks its raining,no traction :cry: