Yesterday my 873 started smoking really bad and then a lot of oil coming out exhaust after about two hours of moving trees taken down from Hurricane Helene. I got it back to my shop turned it off and had to add a little more then a qt. of oil. I ran it again to (it was still smoking real bad) unhooking attachment and move it into my shop then turned it off. Now it will only partial turn over then stop (the machine was only run less then 5 minutes after it started smoking). Almost like the cylinders are full of fluid and can't turn over. I checked oil again and it is a quart low. What do any of you think? Is it possible a head gasket leaking and letting oil into the cylinders or a turbo seal leaking? Any ideas would be really appreciated. The machine has 3400 hours, timing belt was changed about 300 hours ago.