Oily question

[Muff Mewell]

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Mornin' all

Don't know whether I've got the right forum but here goes...

Does anyone know whether Castrol GTX magnatec (10W 40) is fully synthetic?

Only it says on the back, "This oil has been synthetically engineered to....." so I thought maybe it was. If so can I use the half a bottle or so I have left that I used in my old car to top up a Civic Type R until it gets to its first service or should I go and get something else?

All advice greatfully recieved

Andy