sir dieseldude.. just a question.. what is the truth behind the diesel fuel of the different companies around? is the quality different? of is it just the cleanliness of the fuel itself from a particular company.. i have noticed in my starex.. that if i buy diesel from Petron, it feels really sluggish, and the exhaust smoke is noticeably black.. and at idle the engine clatter is also louder. but when i buy diesel from small players.. i can feel the power is better.. and the engine is quieter.

i just wonder has anyone done any test on the differrent diesel fuel from the different suppliers?