The base gasoline pretty much comes from the same refinery. Each brand then adds in the own additives. Stick with "Top Tier" gas and you should do fine. Also, stick with stations that have a high turn over. Gas gets old/bad, so going to a low turnover station increases the risk.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
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