The moisture is very light. There is no evidence of oil. It evaporates almost immediately.
I will try your suggestion to check for moisture on the mats. It may just be moisture on the mats. Living in Vancouver with all its rain, and my short trips, I may have tracked in a bit of moisture.
Its funny that I have never noticed it on any of my previous vehicles.
I will keep an eye on it. Thanks guys, for your input.
1980 BMW 528i