Hello jayz76...
I'll join noma in Welcoming you to LMF...
Your 1250 is about the identical tractor as my 1450... Same old (Great) Kohler engine ...
Unfortunately it most likely suffers from the same thing my CC has ... LOTS of hours on an engine that did not have a filter ...
My guess is that your rings are getting bad, especially the oil rings... The fix is to rebuild it, it's well worth the effort and cost.
OR you could do as I have been doing, I switched to a full synthetic oil, It still burns just as much... BUT synthetic burns MUCH more clean, so you just don't notice it.
I use it very little and this works well for me... but if you are putting a lot of hours on yours, go ahead and do the rings and valves... you will get another 35 years out of it... :smile:KennyV