[harleyron74]

Thanks for the tip harleyron74. I ordered the Blackstone Laboratories oil analysis kit and will send it in to see what they say.

Good idea. If you want to see the Block Tester in use their is a fellow on YouTube called Monkey Wrench Mike and he posted A video a couple of days ago testing his engine for combustion gasses leaking into his radiator. He's got a bad one there!
Again, good luck on your tractor!