With my Mondeo (2.0 petrol, 147 hp, 97.000km, year 2002) I was now the first time not at the brand workshop, but at a “free” service. And I immediately regretted it. According to the invoice, I had 15W40; according to Zetterl in the engine room 10W40. So at least a wrong oil. (if that is relevant: from Agip). Legally it is that this workshop would have to repair anyway, if necessary by complaining. Only this takes and lasts and lasts –> until then the Mo So I’ll pay the necessary oil change myself. Only: Can I drive the now filled oil until winter and then change or should I change it? And: Ford recommends 5W30 – but you read everywhere that the Mobil1 0W40 should be the last wisdom. Apart from the price of the oil: Can it be wrong for my engine to take 0W40 or is it at least equally good? Background: I don’t care if the oil change is now 50 EUR m I just want the best oil possible, then the bonnet too and a year of rest.