Good engine oil plays a role in the noisiness of the car. Im drivin a Ranger and gives me slightly over 600km for rm130. And considering that they use bio-diesel the fuel has bacteria in it...I use the Millers Diesel Ecomax,it increases cetane and kills the bacterias inside and improves mileage. Well the Millers engine oil is fantastic too. If anyone wants to try it just just pm cause i dont think the diesel fuel additive is sold everywhere..just like finding diesel pumps at petrol station. Btw diesel cars always have the torque you need to overtake cars which i really like.