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Originally Posted by UKBXSTR
Porsche approved oils TSB attached - for what its worth some Porsche specialists in the UK say Mobil 1 is too thin and is partly to blame for some RMS issues. Moving to 5w40 or 10w40 seems to cure recurring RMS on some cars.
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With all due respect to those specialists, this is nonsense of the highets order.
Esp given that the lower number of the oil has nothing to do with real operating viscosity nor is viscosity related to RMS leaks.
The RMS leak is a design defect in the Boxster motor.
Read Minnesota Jim's treatment of this topic here on the forum.