Wow thats awsome, iv never heard of any brand motor lasting that long.
Only reason i said the OS will out run is i had a buddy eat his TT pro alive in one summer while his AX was flown just as much and is still ticking hard.
Just my observation.
ORIGINAL: Dyehard
"i know the OS will have a longer life span"
I have a TT 46 Pro that I flew over six years on a Morris the Knife. Over it's intire life it has been run on 30% heli fuel. While on the Morris it was run on a 10X5 APC and tached 15200 on the ground. The only thing that was done to it during that period was to replace the O-rings on the idle needle, when it quit in flight on two consecutive flights I knew something was wrong as it one of the best idling engines I've ever owed. Two years ago I removed it from the Morris and put it in a Lanier Mariner 40 seaplane. With a 10x7 on it the 46 Pro pulls the Mariner, which is a fairly large airplane, with authority, at least as well as a friends 40 size seaplane with an OS 46 on it. I've never has an OS last any better that that. Today I'm going to a nearby clubs float fly with my eight year old Pro 46 on my Mariner, I expect it will run just as well as it has the last eight years.