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Mark's John Deere owners manual from 1996 states:
" The fuel must meet the following properties: Cetane number 40 minimum.
Cetane number greater than 50 is preferred, especially for temperatures
below -20C, or elevations above 1500m." There are more requirements for
sulfur content and guidelines for lubricity.
Reply:
Maybe, I should check my new JD's manual and see what it states. I've never seen Diesel sold anywhere with a cetane rating of 50 or better. Most on road pumps are 40 with some at 45. Come to think of it, I've never seen a marina's fuel pump list the Cetane rating. That's marinas from Galveston Bay to the Chesapeake. I assume this is probably because it may vary with each filling of their tanks. Therefore, just label the pump something generic and meaningless like "Premium Diesel" to keep the lawyers from being involved.
In a gasoline engine running on an octane rated fuel less than it's designed for will often result in predetonation that can destroy an engine over time. Is there a similiar risk with cetane ratings on diesel or just a perfomance reduction. John's obviously run some of the most questionable fuel available with no problems. Can the same be said of the new electronically controlled tier 2 engines over time???
Gil
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