Had my A5 180p 2.0T for a few months now and have had to top the oil up every 1000 miles. I have done 3500 miles in 4 months. Unfortunately last time I topped up, I threw away the bottle of oil. I know it is Castrol but not sure what type to get from Halfords. Can someone help me? I would use the manual but alas I have left that in my other house.