I would not worry too much about using the new oils in the tractor. If you think yours is sludged up flush it out before changing it over. We used to do this all of the time on the older tractors that had been abused with no maintenance.
How I have always flushed an engine oil galley. Drain the engine oil. I usually leave the old oil filter on. Put one quart of new oil back in the engine. Fill it up to the full mark with kerosene. Start the engine up and let it run at fast idle under no load until it has reached operating temperature. Then drain the mixture out of the engine. I repeat this until I get clean looking oil/k-1 mix back out. Then just install a new filter and fill with whatever new oil you want to use.
I have even had good luck on newer cars with rattling valve lifters getting quieter after doing this. I had a 1952 Chevy 3/4 ton pickup and the operators manual said to do this every ten thousand miles.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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