I just checked mine, after 3k miles I only had 1ppm of Sodium.

Ouch, but you have the updated head so it is probably your head gasket.

See know you will know how to do a head gasket on a 617 and 603!

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200