I'm not sure what causes high K levels, but the oil has quite a bit of life in it still since the boron is still so high. I presume you took the same at 2k miles solely to test for antifreeze?

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k