UPDATE: I spoke on the phone with a supervisor from the fuel supplier of the Shell earlier today (I won't name the company for respect of privacy since they were very nice). After a brief discussion, he admitted that they had accidentally sent out a bad shipment of fuel that had been exposed to a water leak, and I guess it had been delivered just hours before I went to the station. He mentioned that he had received calls from other customers with damage claims but he didn't specify how many. To sum it up, he called it a "lapse of concentration" and was very embarrassed because they hadn't messed up like this before, and he was very apologetic and he said that they would pay for my expenses at the dealership as long as I provided proof of purchase from the Shell station. I sent him a cropped picture of my card history which showed the purchase and gave him the number of the Subaru technician. I still haven't heard from the dealership yet but I'm sure I will tomorrow. It looks like things have finally been settled.
