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I just got my new 03 alti 3.5 and I've noticed some pinging after highway driving home from work. It's got 500 miles on it and the dealer originally filled the tank up for me gratis. Does anyone think maybe they used regular 87 oct and this is why it has been pinging? I just filled it up yesterday with 91 and it still pings a bit... Is this normal?! I didn't expect a new engine to be doing this and I'm hoping the VQ engine is 'bulletproof' like the sales guy said.....
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