Bought this l275 a year and a half ago and first time I changed the oil I put in regular not the diesel specific and ran it for an hour before I realized I had to put in diesel motor oil. Then over the winter the block heater wasn't working so I put in a new one, but I just noticed its now half kinked and probably reducing flow (though I saw earlier this year it was pushing coolant around by looking in the radiator. I didn't notice any blue smoke until it was really hot a few weeks ago doing work on an incline. Then it did a few bursts and I stopped a couple of times to let it cool to get it to the garage thinking it needed an oil change or something. Changed the oil, which was black after about 5 hours and more liquidy than usual. After the blue smoke seemed to go away but then it came back recently, and I bought it into the shop which is when I noticed the half kinked lower radiator hose from me improperly installing the block heater (leaving the hose not long enough). It looked like it was ok at the time but over the summer it has warped a little. After I just changed the oil and drove it over to park it, it did one puff of blue smoke for a second. Am I looking at new piston/rings? I have a radiator hose on the way but worried the pistons or rings are not ok. Its definitely blue smoke like 2 stroke. thanks in advance. Forgot to mention it has about 1500 hours and seemed to be running good and well taken care of at least before I got it.