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2,335 Posts
I believe you are right and the have over charged you, the 4.2 V8 use more oil than the diesels and it requires 9 litres. So if anything you've been charge at least 1 litre more than you should have.
Ring them back and get that money refunded, also you may want to phone a different dealer and ask how much oil it takes so you have exact numbers and proof they have over charged you.
Ring them back and get that money refunded, also you may want to phone a different dealer and ask how much oil it takes so you have exact numbers and proof they have over charged you.