Diesel prices hit a new high in four metros across the country on Wednesday. The artes of both petrol and diesel were marginally hiked today for a fourth straight day by Oil Marketing Companies (OMCs). Diesel can be bought today at Rs. 69.75 per litre in Delhi. Diesel can be purchased at Rs. 74.05 per litre in Mumbai, Rs. 72.60 per litre in Kolkata and Rs. 73.69 per litre in Chennai, according to daily price notification issued by state-owned oil firms.