Guys: With all the talk and rants about the 800's exploding, injesting snow etc, I have talked to every service tech I can locate and have found out one very common symptom: operating temperature. Several machines have popped within 2-3 kms of the staging areas. On teardown, signs of 4 corener seizure are evident (shock cooling to those of you that know anything about aircraft piston engines). You may think your sled is ready to hammer on and you could be setting yourself up for disaster. If you can feel heat on the tunnel exchanger then your are good to go, not before. You may think this is bull.... but why take the chance? My old 'Doo suffered from a cold seizure; once! I learned but not before it cost me an entire rebuild ($1500 in 1990). As for the pre-filter patch on the dash, and any other preventative measure, is anybody's machine not worth $30?