[Gurkha]

Bad practice, bad habit, does more damage then anything, carbon accumulation is burnt off in modern diesels with proper IP and injectors in normal day to day running at operating temps, this stupid practice keeps the mechanics quite happy, if it is a turbo diesel, you would coke the bearings and fry the turbo in no time, sadly old and bad habits die hard, ignorance among our average truck drivers is another cause of this should I say uniquely Indian diesel myth.