In other forums there are people who have talked about tests showing the Chevron or Texaco DexCool works well and does not hurt the engine.
If you only need a little, just add water. Don't add a different coolant into the existing stuff. Some people have done this and ended up with jelly. If you change coolants, empty the system and do a flush before you fill with the new stuff.
Porsche approved coolants include "Porsche" brand coolant. That's it.
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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