Guys, my Mum's 211 is due an E+ service and indy wants 250 just to replace oil and filters. I'm thinking I can do those jobs for a lot less than that. But which brand of oil should I use and where is best place to buy from? Opie oils suggests the car needs 5w 40. Helfrauds suggests 5w 40 for their own brand stuff and 10w 40 for Castrol or Mobile. Car is 2002 W211 2.6ltr petrol v6 (112.913) Is Costco still a good place to buy oil from? Any pointers would be most helpful.