Need more details...

Or tell me the truth ... is the engine scrap?
2002S, 66k miles.

When did you notice it? How much have you driven it since? Pictures of the milkshake?

dghii
2000 Boxster S 6speed 112k miles

... which they say is indicative of coolant. Didn't notice it by eye.

Suddenly the CEL (misfire on #5) and losing coolant without a leak made sense.
I've probably driven it 400 miles with the CEL off and on and the coolant up and down.

... sounds like a cracked cylinder
Could be the oil/coolant heat exchanger, but if you had a cylinder 5 misfire ... not good.
Good luck.
Happy Boxstering,
Pedro

Pedro Bonilla
1998 Boxster 986 - 311,000+ miles: [www.PedrosGarage.com]
PCA National Club Racing Scrutineer - PCA National HPDE Instructor - PCA Technical Committee (Boxster/Cayman)

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