I've got a 2 stage with an 80 gal tank, then a 60 gallon tank plumbed to it. The compressor does run more to fill both tanks, but it doesn't run near as often. Had it this way for a couple years now and no problems at all. The rest of the system is 1" pipe plumbed to a dryer/separator then a couple of QD's for the air hoses. My garage is small, so the two 50' air hoses cover the whole place. I'm with Charlie and the rest, I don't use an oiler, just keep a bottle of air tool oil handy. The extra tank serves as a very good water trap and air cooler for the system, too! Very seldom that any moisture even makes it to the dryer.