Mr. Poole,the rouge SLK and Mr Guenther have the only safe options/answers.

If it was sold with dirty oil ... it deserves some TLC. Mobil 1

(AND before you change, get an oil sample sent to a lab with the old oil
to get a baseline for the lab's comparison).Then dump the oil and filter at 500 miles.After taking a "Clean Catch" sample of the 500 mile Mobil 1.

This will tell you more than you ever want to know about the engines health!

'Putting ANYTHING, EXCEPT OIL in the crankcase is just begging for TROUBLE!