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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.
		 
				__________________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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