Operation & Maintenance Manual for WP7 Euro Ⅵ Vehicle Diesel Engine Table 2-3 Oil changing interval according to vehicle maintenance specifications 8 Working condition Item (WG I) (WG II) (WG III) Annual mileage less than 20,000 km Annual mileage less than 60,000 km Annual mileage longer than 60,000 km 1st inspection Having traveled for 1,000-2,000km Having traveled 1,500-2,000 km Having traveled 1,500-2,000 km P Every 5000km Every 10,000 km Every 15,000 km WD1 Every 10,000 km Every 20,000 km Every 30,000 km WD2 Every 20,000 km Every 40,000 km Every 60,000 km WD3 Every 40,000 km Every 80,000 km Every 120,000 km WD4 Every 80,000 km Every 160,000 km Every 240,000 km