Wasn't there talk on the forum years ago about A4's ideally needing leaded gas to protect valves from wear. From my view I have always added a couple of oz of "lead substitute" to every tank for the last 40+ yrs full on my 1966 A4 [MMO in the oil] Still running fine. Admittedly I haven't see it on the auto parts store shelf for a while but still have about quart left.
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