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For the 993 series, it is recommended by the mechanics I trust to use chevron supreme or Chevron fuel system cleaner every 5th tank to keep the valves from coking, which is a known problem for those cars. Haven’t heard that for m96 motors but still do that out of habit for all my cars.
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Brian
Current: SPB Boxster, Macan S, 1984 944
Past: 10 944s, 2 924 Turbo, 911SC, 993, Cayenne, Boxster S, and Cayman S.
Future: 356C
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