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Mixing ethylene-glycol with Porsche OAT coolant.

  • 2014
  • Boxster S
11 000

I inadvertantly topped off my 981 Boxster S with about 2 quarts of ethylene-glycol coolant.  I know that coolant types are not to be mixed but haven't found any information related to how much ethylene-glycol mixed in with OAT coolant is problematic.  The cooling system has 4-5 gallons of coolant so at most it is now 10% ethylene glycol and 90% OAT.  The coolant still has a pink color and operating temperatures are the same as they've always been.  I've talked with the service folks at my local Porsche dealer and it's a fairly expensive job to flush and refill the cooling system - so I'd rather not do it unless I have to.  If anyone has some definitive knowledge on this I'd love to hear it.

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