MB 300D potassium in oil analysis?

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Here are the oil analysis from a 1987 300D 6 cyl 3.0L IDI diesel engine. The engine sat for 2 years before I installed it in my car. It has 186,000 miles. The first numbers are the most recent analysis, with 6200 miles on the oil - Mobil 1 SuperSyn 15w-50. The engine burns about 1 quart every 5,000 miles. The second set of numbers in was the first oil I put in the engine, with about 2800 miles it was a combination of leftover synthetic oils, mostly Mobil 1 Tri-Syn 15w-50. Iron 26 49 Chromium 1 2 Lead 2 9 Copper 2 10 Al 5 7 Nickel 0 4 Silver 0 0 Silicon 6 11 Boron 112 36 Sodium 7 39 Magnesium 125 403 Calcium 2882 3045 Barium 0 0 Phosphorus 1076 1038 Zinc 1222 1244 Moly 67 77 Potassium 28 29 Fuel less than 1% less than 1% Visc 16.82 13.63 Soot 1.2 0.3 Glycol NEG NEG TBN 11.24 9.89 Oxid 4 6 Nitr 2 2 F-Soot 1.23 0.38 I am curious where this Potassium may be coming from? Could it be leftover in the oil pan that hasn't managed to drain out yet? Is it just coincidential that its 28-29 ppm both times even though the drain interval is slightly more than 2X the first interval? -brian
 

MolaKule

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Since you have negative glycol, and a good dose of boron, I'd say the potassium is from the new Potassium Tri-Borate additive.
 
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