I have only seen mention of one thing that may make Mobil One in an older car work out. I have seen posts indicating that it will sometimes leak where dino oil will not leak.
I would think that the thing to do would be change it and see if it leaks. I doubt that it would be a gushing leak if it did. You could go to the next oil change and change back if it were a problem.
I'm sure that there are others with experience about this. Anyone?
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in