Quote:
Originally Posted by danielj
Premium refers to higher octane levels. Diesel doesn't have an octane rating like unleaded gas does.
|
Actually diesel does have an octane rating. However, it is not a measurement that means much for compression-ignition (diesel) engines. For those engines the cetane number is more important as it is a measurement of the combustibility. Whereas octane is a measure of compressibility before ignition. For a gasoline engine both air and fuel are compressed. In a diesel engine the fuel is not compressed only the air. The diesel octane rating is in the 15-25 range.