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RE: Whats the sodium for?

I don't think the OEM valves on NA Audis are SS (Stainless Steel).
(but then I was wrong about the sodium-filled valves!)


>For severe-duty turbo service, are the sodium-filled valves better or are
SS valves better?

Audi used sodium-filled valves on turbocharged engines and solid ones on
N/A engines. I guess this answers the question.