I also blew through Mobil 1 in both of my R's, I switched to Castrol Syntech and the usage lessened but still used a bit between changes. I switched to Agip 10W60 and usage is non existant. But my car is not a daily driver, only used for Track and Autocross and I change the oil at about or less than 1,000 miles, before each track day or generally after about 3 autocrosses. I always check the level before startup, Always. And my car is stored in the winter.