Quote:
Originally Posted by mav1178
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.
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You're right. It's not required but recommended. The service manual gives the part number for the coolant and the cooling system conditioner so obviously it can be used in a BRZ.
I guess if you want to leave it out, that's your choice. But it's only $6 or so, so why leave it out and take that chance?