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Well one quick thing about the petrol that was put in at the start of the cars life was it just the wrong grade or did the put disel in and it was suppose to be regular un-leaded. Putting the wronf fuel can kill a engine or excell the death of it. I would try that angle with the lease and put the blame back on the dealer.
And 5w-40 seems a little low I would have thought 10w-30 for a warmer area of the world. Here in Canada in the dead of winter we use 5w-30.
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