Wow! Thanks chaps for the info, I've enquired at the dealership, who of course say Castrol 'Edge professional' and with Castrol's Tech guys who tell me, like you have, that the professional/trade version has a uv dye in it, I presume to easily eliminate warranty claims, and that Professional & Edge are perfectly miscible, and suggest I use which ever is convenient for me.
I have used Mobil 1 in the past and thought I would be able to use a mobil oil in this car, but the thought of warranty hassle doesn't lie easily.
I've found that Nielsen CDG prices seem a bit lower than Opie. which balances the delivery cost.
It sounded a bit like 'Dipsticks' at dawn, except they've done away with those now, just don't mop your brows with an oily rag, it gets the neighbors worried.
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