In the US a 91-92 RON is equal to a 82-83 MON, the average of which is 87 RON+MON/2 - what nearly all pumps display.
If your manual is recomonding 93 RON you should probably be using a 89 octane rating. However - if you have been using "regular" for years (probably 30 years) why the sudden concern?
What IH tractor recommends 93 RON? I thought most recommend 91 MON. Most of the issues I've seen with knock in these low compression engines has much more to do with improper timing, excess carbon build up and incorrect carb settings (too lean) than detonation due to low octane rating.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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