curiosity lang (pinapansin ko kasi at inaamoy-amoy everytime tumatawid ako) i've noticed that during idle, iba talaga ang amoy coming from isuzu engines like 4ja-1, same as fuego, PUJ'S with isuzu engines and even isuzu trucks (6-wheeler to 10 wheeler) but differs from trooper, revo diesel, adventure diesel, ford ranger, everest and nissan diesel (hindi sila masakit sa ilong) ramdam mo lang yung init nila dahil walang usok.