Don 656, in order to see whether or not 89 octane has at least an R rating of 93 we have to know the M rating. My reading indicates that the US version has at least 82 octane, thus if my calculations are correct 89 octane gas by the average of R+M has an R rating of 96. The M value can be as high as 85 and still have an R value of 93. If M is as low as 80, the R value is then 98. In other words with an average octane of 89, as the M value increased, the R value decreases, and vice versa. The ONLY way to be absolutely sure is to see if your distributer can find out what the M value, or better what the R value is. But, IMO, there is no way that 89 octane based on the (R+M)/2 octane is NOT going to be suitable for IH 6 cylinders. Many say that 87 is ok, but I can see that depending on the condition of the engine it may be borderline. I will also say the the only 6 cylinder I have driven is a 460, the manual says it needs 80 by the motor method or 87 by the research method. I will agree with Tractor Vet that it depends on how heavily the engine has been modified, or how carboned up it is, but that is as far as the agreement goes. Also if it does not detonate it is ok. My ears are too far gone to hear that anymore. Without further data or absolute proof, which no one including me and Tractor Vet actually have, you simply have to decide for yourself. I have entered into this discussion, because all my life I have been told and have read that low compression engines do not need high octane gas. Tractor Vets comments are the exact opposite of that, and I simply do not agree.
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