Here is the deal I sunk my sled in about six feet of water for approximately 1/2 hour. I know, stupid thing to do but ive got to move past me being an idiot. I'm not sure what to do now, the sled is an 04 F7 efi 700 miles. I initially pulled plugs cranked her over and got her running to get her back to my garage. On the way home she quit and we couldnt get her started (we figured ice balls) so we towed it home. I drained all fluids (oil, fuel, chain case) and poured marvel mystery oil in the heads and exhaust and let it sit and thaw for a couple of days when I tried to pull her over she was siezed. A wood dowel through the exhaust was able to pop the engine free very easily. I had also pulled the pipe and air box. I then puled the return line (????) from the crank case to the oil pump and let it drain down with the marvel and any milky oil that was whipped up. I dried out whatever I could and refilled the fluids and got it running. It seemed to run fine. Here are my questions. 1) will the milky return eventually work out? 2) looking through the exhaust ports/manifold I noticed some scores and possibly some slight metal smears (???melting) near the ring goves, how bad is this? 3) what are the tell tale signs that the engine has been submerged? I really want to know the answer to #3 in case I need to warrantee anything. I know that swimming voids a warrantee but if I can get the thing running fine and a 3 months down the road the thing melts down I might try to get warrantee work done. I just dont want my dealership to know or get stuck with the bill if Arctic Cat has a was to see its been under. I know this was alot of reading thanks for the help.