I have a 98 E320. So is it perfectly normal for it to consume approximately 8 quarts of oil every 5000 miles or so? Every time when the computer or dip stick shows the oil level at bare minimum, I would add about two quarts in there and it returns to normal. However, recently after showing the oil is at bare minimum and adding two more quarts of oil, today the computer asked me to add 1 extra quart after about 1000 miles or less. Is it normal? Could my piston ring or valve guide be the culprit of such excessive oil consumption? If so, what kind of test should I ask for when I bring the car to the dealer? Will MB warranty the repair based on the recent class action settlement? All your comments are welcomed and appreciated.