Top up with 15/40 oil when using 10/40????
Just wondered could you top up using 15/40 oil. I am currently using 10/40 in both cars,just that Asda has got a deal on 4 litres of castrol 15/40 for £10, would only be using for top ups both cars only doing around 4k miles p.a. each change oil/filter every year using Mobil 10/40 any problems likely to arise????????
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|10 or 40 , 15 or 40 , oil , top|