Just a short note here. If you don't like the smell of hoit oil splashing around your engine bat, do install the proper rubber top seal on the dipstick, and never run the engine with the dipstick removed. Rotation of the crankshaft throws oil with a vengence directly at the bottom end of the dipstick tube. The slightest internal pressure and a little vent flow will throw out a lot of oil there if the dipstick tube is left open. Simply leaving the seal off of the dsipstick can sometimes allow a small leak.