Posted by AG48 on October 07, 2012 at 20:28:45 from (76.255.73.100):
Well, Ive always heard that when all else fails -you should read the manual, so that's what I've done, and here's what I've found. The fuel my IH tractor (gas) is supposed to use is 93 octane rating (Research Method).
For years I've used regular and have not had any problems, except for one stuck valve after I switched from leaded to un-leaded fuel. The motor shop changed the valve seats to a type suitable for un-leaded fuel to correct for this, and I use Sta-Bil to treat the gas if it's not going to be used immediately.
All of the gas pumps at the filling stations have the octane number shown as by the R+M/2 method. This means that the octane number shown on the pumps is the average of the octane number as measured by the Research Method and the Octane number as measured by the Motor Method.
My options are octane ratings of 87, 89 and 92.
Which of these conforms to 93 octane (Research Method)?
Maybe I should leave well enough alone, but now that I've opened this can of worms I would like to know which fuel conforms with the 93 octane etc.
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