5000 hrs. on a Lehman is just getting broken in. 10,000 hrs. is easy,
and a lot run up to 15,000 hrs. with no problems. The trick is to
change the oil, oil and air filters often. For oil, every 100 hrs. or
annual, or 200 hrs. if you run hard and all the time, like a work boat.
Call American Diesel if you have questions; Bob Smith was in charge of
marinizing them all. 804-435-3107. Make sure you use a good oil rated
for diesel. I use straight 40 wt. Delo 400 in mine. Shell Rotella is
good as well. I'm in Texas, so it's pretty warm year-round. You would
want to use straight 30 wt. up North.