Is this the correct oil?
I'm looking for a bottle of top-up engine oil for my 2010 Ford Ka 1.2 petrol. The manual states SAE 5W-40 (WSS-M2C917-A). When I enter my reg.no. in on the Halfords site the search returns Castrol Edge Turbo Diesel oil 5W-40 but my Ka is petrol? I also see that Halfords do 1 litre own brand 5w-40 and 5-40 Diesel ?? What is the difference between these two and which is the correct oil for my car?