Motul 800 2T, Motorex Crosspower 2T, Bel-Ray H1R are all premium ester based synthetic oils. The ester based oils are the most expensive, but provide excellent protection and a clean burn. I've used all 3 in two-stroke racing engines from dirtbikes to a Yamaha TZ250 roadracer and they all work well, but I like the smell of the Motul 800 2T the best, especially when mixed with 100LL avgas. I've read numerous stories in msnowmobile magazines and online about Blue Marble and the conclusion is, it's a good oil, but you can buy better or equal oil for alot less money. Their claims of increased power, etc were pretty much proven to be false. There are 3 basic types of oil base stocks: 1-Petroluem 2-PAO's (Polyalphaolefins) and 3-Esters. Petroluem oils would be the cheap stuff that wroks fine in most cases but is dirtier, more carbon buildup. PAO's are the next step up, and the Esters are the top of the line oils. You also have castor oil from a number of companies that gives the best engine protection, maybe even a little better than esters, but is pretty dirty burning and some don't like the smell. Castrol makes a part synthetic, part castor oil called A747, which is a great oil too, protection of castor and clean burn of synthetic. You can find Motul online for about 15$ a quart, which isn't cheap, but will make 10 gallons of fuel at 40:1 or 12.5gal at 50:1. I'm guessing thats enough for a whole season of flying? I've seen local guys with DA150's using amsoil at 100:1, it scares me a little, but they have no problems. Model airplane gas engines are in the 1hp/10cc's power output range. A TZ250 roadrace engine is about 1hp/3cc's and run great on any of the premium oils at 32:1-40:1. So they're probably overkill, but you don't use much and the extra protection is there on a lean run if you need it someday and they keep the inside of your engine much cleaner.