gonz
+1y
detergent oil foams inside the crankcase and then the foam is slung away from the crank and rods thus causing loss of lubrication. a non detergent will not foam and will splash back off the walls of the crankcase and keep the crank submerged in oil. also the foam from the detergent will blow by the piston rings easier and cause more common intervals in adding oil. hope this helps. and yes you need a separator to keep the oil out of your air system. without it you will have massive amounts of oil in your tank, lines, valves, pressure switch, and even in the bags.