Advice needed for Maverick engine oil.

[David G Rand]

Could somebody please advise me if the following oil is suitable for my 1996 Maverick GLX LWB 2.7L diesel estate.

"Castrol Magnatec 10W-40 A3/B4. Part synthetic, suitable for petrol and diesel cars."
That's all it says on the can (4 litres) and makes no reference to being suitable for turbo charged engines. I bought it from Halfords and was told at the store that it was the appropriate oil for my engine, but I've since heard that Halfords are not always to be trusted.

David Rand.