Does higher nitro content make your engine have a shorter life span, if so why?? and does anyone know what is %nitro recommend for the GXR.28 engine in the kyosho giga crusher readyset im currently running 15% and have only run about 12-13tanks through it and i was thinking of going to 20% when my fuel supply finishes which will be in about 3-4 tanks

it's more dependent on the oil content in the fuel. If you go from like a 15%nitro/20%oil up to say a 20% nitro and 10% oil it MAY wear the engine faster, but it might be negligable. Lots of LHS are somewhat dishonest in that they'll feed you an old wives tale to get you to buy the "better" (usually more expensive) products.

Car Fuel Facts,
http://www.horizonhobby.com/Articles...ArticleID=1318

Sweet mother that's the best info I've ever read, should be a sticky and is getting bookmarked by myself for future reference. If there was a points giving system here in the forums, you my friend would get all I had Thanks!