After extensive research here and at the dealers, ITS A GT 5000 for me!
Downloaded the manual and didnt find any mention of a break in period for the engine.. Is there any special procedure for treating a new engine?
Most I read about tractor break-in (recommended on other makes)
1) just ride around for 1 hour (no mowing, pulling..) engine WOT, but various ground speeds
2) just ride or mow for the first 10 hours (before getting into any attachment use)
3) at 10 hours, change engine oil (use dino, cannot use synthetic before 50 hours)
of course, check air filter, oil level every time...
New engines are mostly designed to run WOT (full throttle) all the time.
For a Kohler, its best to let the engine get fully warmed up (20+ minutes)before shutting down (otherwise the condensation just becomes water mixed into your oil--bad. full warm up gets the water evaporated out)
There is a 3 part video, supposedly from the one that Sears supplies, on Youtube. I looked at it last week, and seemed to answer all my questions about my LT1000.
Look under Craftsman tractors. I think that's where it is.