twochai, you are absolutley correct in your statement re piston engines, however with the development of some new engines along with a few smart folks getting back into new build engines along with Diesel things are starting to look up.The real problem at the moment with at least one make of engine is the passing on of those with lots of piston know how, for instance one shop which had a fine record was purchased by "investors", {run the other way when this hapens to any company}, the result ? on one of our aircraft had two total engine failures, one at 20 hours since major, and another at 300 hours, both entailed major break up of the engines, one due to FOD left inside , and incorect assembly in the second engine, The 100LL question is close to a solution but not on the open market as yet. In the case of some of the older turbines the same situation is developing as in the piston market.