Oil change at 5000km for turbo diesel, everything else at 10km. You need 3.8 litres if you don't change the oil filter, 4.3 litres if you do. Make sure you use a fully or semi synthetic 10/30w oil for a Turbo diesel. The most commonly available is Castrol Magnetec but there are others from the major oil companies. Mobil 1 seems to be very popular in the States. All are over £20 a gallon. Best to buy oil in bulk from the motor factors - around £8 per gallon for 5galls/25l. After the change the oil will immediately turn black again. You'll never flush out all the soot!