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They could just send it to their friends at an oil company as a favour though.I love the idea of my local oily rag dealer running a fuel contamination test like something out of CSI/NCIS.
I spent the last 3 weeks specing up and pricing a Lab for a refinery, believe me they haven't got the gear.
Unless they are testing for something truly obvious (water so bad you can see it in the sample or particulates so bad you can see them) they aint finding anything.
I'm sure the car threw an error code related to fuel, but as people have said unless a lot of people at the same filling station have the same problem then I would imagine they are going to say its not their fault.