Just changed the oil on my 2001.5 B5.5 Vr6 with Mobil 1 10w30 as it was the only synthetic the Advanced Auto had this morning along with a K&N filter (ONLY damn filter they had for the Vr6 period). Now I've noticed an increase in valvetrain noise, lifters, etc. I haven't driven it yet, so I am hoping the ride into work gets it up into the engine better than idle rpms. Any insight???