Hi I have about 11 hours on my b2301 and I have been starting the tractor and moving it out of the garage. then letting it sit and idle for a few minutes while I find something else to do like shovel the sidewalk. the temp has been between 0 and - 20 C 32f to 0 f I cannot see myself wasting that much fuel and time I sometimes use the tractor for a short time so a 5 minute warm up seems crazy if it means the tractor is just sitting there idling. So my question is does warm up mean just sitting there idleing for 5 -10 minutes or using the tractor at a low rpm and slowiy using the hst and hydraulics? The tractor is in a attached garage which rarely is below freezing. I pull the tractor out of the garage because I do not want the fumes in the house. When I do the 50 hour maintenance I will change to synthetic engine oil.