John,I think would to wait for your next analysis to see if this trend is showing more amounts of glycol in it.You may want to move your next analysis up to a sooner date if you feel uneasy knowing something has just appeared for the first time.These samples are pretty amazing,when I worked at a former aircraft engine manufacturer the oil sample came back saying something with 100 percent aluminum was showing up on the oil sample.Problem was there was nothing 100 percent aluminum in the engine.Engineering had the engine removed and torn down,come to find out someone had used aluminum tape to seal something off ,and all the tape didnt get removed prior to reassembly .And a piece (very very small) had gotten in the oil system and showed up on the first oil sample after re-installation.Good luck,Johnny

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85 300sd SOLD ,85 745i,95 740i,1972 Suburban,1938 International