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Not a frothy mess, but milk chocolate color when drained and very small amount of foam on the oil cap.
Small amount of foam on oil cap is normal, comes from short trips and condensation forms and is not burned off from not running at operating temperature. Now the milk chocolate colored oil is another story. If it is running OK I would drain and flush it, do an oil and filter change to see if it comes back. If it does you have a problem, if it does not, grab your "friend" by the short-hairs until he fesses up to what he did with your rig

David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA

"Serenity through Sobriety"