Hi there guys I was wondering if anyone could help me out with a potential issue I'm having with my A4 B7. I bought the car a month ago and did an oil service on it a week back. I replaced the air filter and oil filter and changed the oil. I used 5w 504.01 Catrol Edge. I put 4 litres in it as the manual said 3.8 and after using 4 was just right on the dipstick. After the oil change, everything was okay made sure until I took it for a decent run on the motorway when a yellow low oil warning came on the dash, I immediately drove 10 mins to a Halfords and filled it up with it more oil after seeing the oil was indeed on minimum. Since then it has come up once more. But I notice now that the engine makes a ticking/fluttering noise when idling and seems a bit rough. Has anyone experienced this before after a oil change? Did I do something wrong to filter/oil I used? Or is it just the different oil creating a different sound to the engine. I'm looking to bring it to a local mechanic soon enough but don't want to drive the car too much with this present problem. Any help would be appreciated.