Posted by karl f on April 01, 2011 at 12:23:26 from (209.188.106.159):
In Reply to: 87 octane posted by Jerry Gilliam on April 01, 2011 at 08:28:12:
The fact is a 656 owners manual says "93 octane minimum, research method." I have heard the 560 or 706 etc. manuals say the same or similar things. The problem is today's gas is rated by the average of both octane rating methods (motor and research), so without the spec sheet of the fuel, you don't know what the research number really is. Those 6 cyl IH gassers were built for use in tractors to the point of self destruction, which the higher octane helped slow because the pistons wouldn't overheat and score the liners. Tractor Vet and others have discussed this extensively in the archives. I believe if you aren't working them to the max, 87 (R+M/2) is just fine. And anything in stock form pre 58 or so would be fine with even less of an octane rating.
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