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...