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Old 06-25-2013, 12:02 AM
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whunter whunter is offline
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,354

Originally Posted by funola View Post
but the radiator, stat housing, heater core is alum.
We are talking of coolant corroding the aluminum cylinder head from the inside = weakening = cracking.

On the OM617 and earlier engines:

IMO; The radiator, thermostat housing, and heater core are extremely rare issues if the coolant is changed on schedule.

My rule of thumb is to drain / flush the cooling system a MINIMUM of every three years, or when the coolant test fails -45 C, regardless of miles driven.
WIS document# WH20.80P-KW00-00z

I have seen many abused engines that have original factory coolant at 250,000 miles, the cooling system corrosion is shocking. Often they require a cylinder head gasket.

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