The bottom line here is that all the info except the longevity factor are useful, even if made totally of unobtanium they will wear out. By the same token I have an Enya .46 MKII, a Saito .80 and Saito 150 all about 10 years old and none has lost anything performance wise. Even my lowly Merco .50 which was supposed to be a poor engine and is older than all the above will still turn a 12x6 at 8,800 on 5% nitro fuel and fly all day without so much as a hiccup. Try a four stroke and you'll love it, quaranteed.