Stricter emissions standards have resulted in large changes to the composition of automotive diesel fuels.
In particular, the refining steps required to remove excess sulfur from diesel fuels has led to a significant loss of lubricity.
Whether measured by the High Frequency Reciprocating Rig or Sliding Ball tests, low and ultra-low sulfur diesels have poorer lubricity than the older diesel fuels.
Bosch even uses brand-new injection pumps to test diesel fuels for suitability - a rather expensive method.
This problem can be aided by the addition of additives which boost the fuel's lubricity - like 2T oil.
Increasing the fuel's lubricity is a common practice in diesel fuel additives.
Last edited by duskylim; September 11th, 2010 at 03:08 PM.