Participation or precipitation?
You don't need to worry about the time (~1 hour) that the fluid is exposed to the air (whether humid/rainy or dry) during the flush and bleeding procedure.
You do need to worry if you left the reservoir cap off for a week.
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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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