I have probably put around 500 hours on this tractor with the mid grade 89 octane gas of which at least 300 hours were working the tractor hard. Seems like if the 89 octane was going to damage the engine that it would have done it by now. I recently did some heavy field work with it. I started on 89 octane and switched to the 93 octane when I had to add fuel to the tractor. I couldn't tell any difference in the performance of the tractor.
My basic question is this: Does the 89 octane mid range gas (average of R & M, and which is at least 93 by the research method) satisfy the operator's manual minimum octane rating of 93 research method or not?
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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