Hello everyone, I just recently bought an Audi A4 B6 1.8 T with 62k km.Initially the engine was very quiet but when I changed oil with Mobil1 ESP Formula M 5W40 and Mann 950/4 filter (we all know sludge problems of this car) engine started doing a "diesel engine" noise for the first second after cold starting.I traveled only 800 km with new oil and it all returns to normality after one or two seconds.What can the problem be? I apologize for any errors writing in english. Greetings from Italy.
Last edited: