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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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