I got 6000 miles out of my 2000 mxz 700, before the crank needed new bearings, the crank never really blew, the sled still ran but with a grinding noise. This all too I think could have been prevented- my stator got messed up when my recoil broke due to a piece getting lodged in the magneto. All this threw off the timing of the sled and it was backfiring etc.
I've never seen an oil brand that has caused a failure. Any good quality oil made for snowmobiles will work. Will synthetics add life? I doubt it. However, I run them for two reasons. Ease of cleaning exhaust valves (mine haven't ever needed cleaning), and ease of cold weather use (-30F and below).
I have seen DOZENS of fuel related failures and even more realated to cooling issues. I have seen lots of piston failures that have had nothing to do with oil and I have seen crank failures with nothing to do with oil..
Quite frankly, it's a crap shoot on how long a sled will last..
I've been hearing lately that the life expectancy of the pistons on the 800 is
only about 1200-1500 miles before they start to develope stress cracks and have
the potential to grenade the motor. I think that this is mostly the case
regardless of what oil you use. Just some food for thought and something you
might want to check into.
A forum community dedicated to snowmobile owners and enthusiasts. Come join the discussion about performance, troubleshooting, trails, maintenance, riding tips, modifications, classifieds, accessories, and more!