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Discussion Starter · #1 ·
Does such a rating exist? Or somthing similar, is there and different quality levels of diesel?
 

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Hi, I'm Earth. Have we met?
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NOt all states require posting of a fuels cetane rating on the pumps, like here in PA. MOst fuel will be between 40 and 50 with closer to 50 being considered preimum diesel!
 

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Discussion Starter · #4 ·
Thanks for the info. Im gathering all the knowledge I can befor I order my new truck, Im new to diesels.
 

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The cetane requirement of each engine will be in the owners manual. The higher cetane rated fuel gets less fuel mileage than lower rated-ie, #1 diesel fuel is refined for really cold weather use and but gets less mileage. #2 diesel fuel is refined for warm weather use, gets better mileage, and has better lubricating qualities. This is one reason ULSD (S15), requires bio-diesel or another lubricating product be blended in to replace the lost lubricants in the refining process. here is my source: http://http://epa.gov/oms/hwy.htm
 

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Ray-
wait a second.... the higher the cetane the lower millage? you might want to rethink that. cetane makes the fuel burn hotter resulting in better economy.
 

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Ray-
wait a second.... the higher the cetane the lower millage? you might want to rethink that. cetane makes the fuel burn hotter resulting in better economy.
Not the way I read the link. Use the dogpile search engine and type in 'cetane requirements". You'll find many more websites to substantiate my post. This is just one example: http://www.globalfinest.com/tech/cetan.html
 

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Cetane vs. Octane
The cetane number of diesel fuel is an indication of how easily diesel fuel will ignite under compression whereas the octane rating of gasoline indicates it's resistance to auto-ignition. It's preferable, in both instances, to have a high number but, whereas a high cetane number indicates an ease of ignition, a high octane rating indicates a resistance to ignition. (When low octane gasoline is used in a high-compression engine it has a tendency to ignite, in much the same way as a diesel engine, before the spark from the plug. This produces 'engine knock'.)
 

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