This is a weird one, but I have noticed on two occasions that my wife's 2012 F10 550xi has had a small (18" dia, approx) pool of liquid on the garage floow underneath the trunk area. The pooling tends to collect directly under the passenger side muffler. The liquid feels a little tacky - not like water, but not like oil. No discernable smell (and I don't want to taste it
).
Anyone else seen this, or ideas on what this might be? I live in Portland, OR and even though we get a fair amount of rain here both instances occurred on dry days where there was no opportunity for water to collect underneath the car.