Hello, What oil spec should be used for a 2001 Mercedes W203 C200 CDI (euro3, no DPF)? I was reading that both 229.3 and .5 should work. The car in question has approximately 310.000 km, runs great and at the moment is using a Mobil 5W30 ESP Formula which is a 229.51 spec and I guess it's not the right oil for the car. Regarding the weights, should a xW-40 be used? The temperatures are rather high at the moment, going all the way up to 35 degrees Celsius. When it comes to the actual oils, I could get Mobil 1 0W-40, Castrol 0W-40 A3/B4 (some others as well) and any Liqui Moly oil as I live in Germany. What oil would you guys recommend? Thanks! Later edit : what is actually rather strange, is that both Castrol and Mobil, using their oil selectors will recommend oils with the 229.51 spec for this car, even if they still provide older MB spec oils.