I went with Rotella T6. Hopefully the diesel oil does my engine good. Lots of the s4 2.7t owners also said they used rotella in their cars with 5k intervals. I will probably be use it for 6k maybe 6.5k since i dont have turbos to worry about like they do.
I am currently using M1 0w40. Have had no problems other than the 1 quart that vanishes every 4000 miles. I think it is this reason my Car is throwing a code for Catalytic efficiency below threshold on BOTH banks so..
Im wanting to reduce the oil consumption but stay in the 40 weight because...