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I was thinking moisture in the tank as well. Could have been bad gas too. Pouring 87 will not damage the car. The ECU will retard the timing to adjust to the fuel. By you mixing the 87 with 93, you just averaged it out to 90.
Also, the fuel filter is non-serviceable. I asked about this about 2 years ago when I was having some maintenance done on the car.
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