I,m from Bulgaria, Europe.This is my first diesel car.It has cpf/dpf .The oil recomendation is API CH-4 or above(V.G.T. engine)/ACEA B4 or above,SAE5w30.Most of the oils for diesels are ACEA C3.I used Motul X-Clean FE 5w30 .But when the engine is cold it is noisy.Can you recomend me engine oil from ENEOS,Mobil 1,Castrol,Total.ACEA B4 or C3 is better for this engine?Here I prefer to buy RP HPS-5w30 but I don`t know if it is suitable for cars with dpf.Please give me suggestions!Thank in advance!