2008 E550 4Matic; 2011 ML550 4Matic
It's 2005 E320 4M, with 128,000Km
. Water pump damaged so I changed and filled up G-05 coolant.
But my question is, why there is rust on water pump? Is that normal! Or the coolant failure? (It is said 15yrs/150,000mils protection)
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