hey was just wondering how to cut back the oil consumption on my 07 f8? 2 liters for 130 miles is a little much isn't it? also with using that much oil would it cause it to be a little/lot gutless? it just doesn't seem to have the oomph an 800 should have. i did clean the power valves last night and it did improve marginally. also how can u test to see if the servo for the valves is working?