Quote:
Originally Posted by sly
Anytime the coolant is drained out of the car, Subaru recommends adding their cooling system conditioner when refilling with antifreeze. They put it in there from the factory so unless you have changed your coolant, it should still be in there.
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The factory service manual says nothing about using the conditioner to prevent head gasket leaks.
If this was a known issue they would list it as "required materials" instead of "recommended materials" in the Service Manual.