I have a 1999 BMW M3 with a high mileage engine. It is only driven on the street but I do drive it hard some times. Right now it is using about 1 qt per 1000 miles of redline 5w30 and this is common for these engines. One of the top engine builders recommended that I switch to Rotella T5 10w40 to reduce the consumption. (I live in California where the temperature is warm) Apparently that is a synthetic blend but I would like to use full synthetic and have heard of BMW owners using Rotella T6 5w40 with good results. My oil change interval goes by the service lights which can be up to 9000 miles. Which oil would be better for me? Thanks
Andy
Andy