Went into Halfords last week to get a part for kids bike and spotted a promotion on PETRONAS Syntium 7000 oil. They had 5L 0W-40 (and other viscosities) Fully synthetic API SN, ACEA A3/B4 which was MB approved 229.5 at £40.99. That works out at £8.20/litre which is in some cases better than half the price of other brands. As PETRONAS is a major sponsor of MB F1 and develop oil alongside MB ,the packaging has Mercedes Benz and AMG branding on it my guess is its a bargain, especially if you have and engine that uses oil. As many do. Other brands look to be a similar price until you notice the containers are mainly 4Lt not 5.