Yes it DOES extend engine life even though the hp drops after a couple of runs, to fix that just run the engine on standard gas-oil for a while the only reason you have loss of preformance is coz the oil in nitro is NOT flammable so sometimes you get it dripping out the exhaust which obstructs the flow of those (great) fumes and slows the engine down about half a tank of gas consumption should clear the oil from the pipes. It's your choice make the right one.