This isn't normal. Take it back to the shop and have it checked again.
If its not leaking outside the engine and evaporating (most likely), its leaking inside the engine (not likely but really not good). Also, check for coolant in the oil.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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