Castrol Magnatec 2L car oil 10w40?

normally mate..its 5w 40 or 5w 30 for meganesport.
you can actually get the magnetec is 5w 40.

might be a bit thick.

 

not ideal viscosity for winter start-up protection, engine would be happier with 5-40

 

something like shell helix 5w 40 can be had for very sensible money if you look around.
Remember though you will need 6 litres.So a 5L can and a 1L top up.
Just put it in my R26,using one of the Eurocarparts sale codes.

 

https://www.eurocarparts.com/basket

here we go with the sale..£26...more than up to the job,and many on here use it.

 

https://www.carparts4less.co.uk/basket

or this is you want to go the next level up,with 5w 30....at £22 with the promo code,thats a amazing price for such a good oil.

would have to check if 5W 30 is ok for the megane.