Could it be just that someone's put the wrong coolant in and they've mixed?
Have you tried flushing the system and refilling with new G12++?
Just a thought.. :)
5w30 or 5w40 are what you want.
Quantum Longlife III (5w30) or Platinum (5w40) can be found fairly cheaply here:
Quantum Oil Range - Synta, Longlife, Platinum
Just bought some Platinum myself :)
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