1. 6 months; 4900 miles oil low (light came on and checked confirming low level). Is this common to have to add oil around this time?
2. What type of oil should I add. Is any store brand acceptible (Mobil-1.. have seen others comment on ratings not up to BMW recommended specs) and if so what specific type and specs, or do I need to order BMW brand and wait several days until here.
thanks