I have a Peugeot 108 but have previously only ever owned Ford Kas so I'm wondering if I can use the products I have here or if I need brand new ones. Does anyone happen to know what oil it takes? The manual isn't very helpful and just says: I figured they're working in cahoots with Total Quartz and I could easily buy Tescos own, I just don't know which one. I don't do any form of intensive driving so I'm guessing I can go with either of the other two. What if I buy the 10w40 but there's already 5w30 in the car? surely it can't be safe to mix the two? I've dug out my warranty/maintenence book and it has a cross list of all cars and all oil (including 0w30) and my model has a tick in each box! So I could use either one? Same goes for screenwash, I can check what colour is already in there before I buy more but can you mix colours?