Gilly, I'm not driving my Mercedes much at all, mostly due to the price of premium gas vs mileage the car gets. There have been years when I've only put about 2,500 miles on it. My little Miata gets great gas mileage, I mostly drive that car. I guess I have been agonizing over the oil. My main concern is that I don't put in oil that will mess up my engine. I want my Mercedes to last me for my life, I don't want to have any more car payments.