Best engine oil for K10 1.0 litre auto?

Folks, just wondering what the recommendations are and how much oil does the little 1.0 litre need?

I have 5 litres of Castrol Magantex 15-40w high mileage oil (car has covered 33,000 miles).

Is that ok shall I pop to Halfords tomorrow and get something else?

:)
 
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