TCW3 will not harm the catalyst. It doesn't have high levels of phosphorous. The naysayers need to think a little before going postal on the OP...I know that it's sometimes hard to do when you look at a topic like this. Your car can burn a full quart of SM rated dino oil with 800ppm of the nasty stuff in 2000 miles and the cat is designed for that type of contamination load to still last >85,000 miles.
The 600:1 2 stroke ratio definitely helps keep fuel pumps alive, and with the in the tank designs containing non-serviceable sub assemblies (even the fuel fiters are in the tanks on some models- a crazy concept) this is an absolute blessing! MMO probably does the same type of thing, but it costs more hence why guys are burning the 2 stroke to deal with the evil corn juice!
The 600:1 2 stroke ratio definitely helps keep fuel pumps alive, and with the in the tank designs containing non-serviceable sub assemblies (even the fuel fiters are in the tanks on some models- a crazy concept) this is an absolute blessing! MMO probably does the same type of thing, but it costs more hence why guys are burning the 2 stroke to deal with the evil corn juice!