Seems to me that the Trop Artic has a better film than some other oils,thus improving blow by in the ring belt and worn valve stems,due to the G-3 and 2 blends,they also have a bit different add pac also,very good,results can be said after a few change outs,filteration can be a factor also for a cleaner oil apperance,detergences and dispersents give up the crud in filter more easy,rather than cling to lubricant instead of continual suspension in a new oil.BL