that's why i posted before an article about diesel engines / fuels:

http://tsikot.yehey.com/forums/showthread.php?t=16358

sulfur content ng diesel fuel natin is currently at 0.05%. although malaki na rin ang improvement pero hindi pa rin sapat.

ang euro III, 350 ppm (part per million). while ang euro IV, 50 ppm ang requirement.