Fuel quality is of extreme importance in operating a farm tractor. I believe the sincerity of the The Tractor Vet in his insistance on 93 octane fuel. I respect his opinion. I believe the fuel delivered by the bulk distributors in his location was of poor quality control (especially from one source, maybe a particular brand or farm supplier, that had a desirable price. (I suspect it would not have gotten to 85 R+M/2) I have been around farmers with 6cyl gassers that have used "regular" gasoline in them from new without any detonation issues, and expected engine life. When the lead free fuels were introduced no changes were made. When alcohol was added, no changes. IH Oil with Low ash was used (or premium brand name diesel oil that had limited ash in its formula). A coked up engine with radical deposits in the chamber will be far more successful staying alive on 93, than 87 R+M/2 fuel. I found this in tractor Data .com if it is relevant. Jim Interntional Harvester C291
Fuel: gasoline
Cylinders: 6
Valves: -unknown- Bore/Stroke: 3.75x4.39 inches [95 x 112 mm]
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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