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My 300D came back with elevated potassium last time also. Supposedly the primary suspect is antifreeze, although the water and antifreeze were both 0.0%. (Of course, the water and antifreeze are measured down to 1/10 of 1%, while the potassium is measured down to ppm's).
Some oils contain potassium, but the oil I have been using does not. I am 2000 miles away from the next oil change, so it will be interesting to see if there is any change. If it goes up, I guess it could be a sign of a head gasket leak.
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Palangi
2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg
TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE
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