Here is all the endorsement one would need to use Agip, FERRARI. In all the books I have on Ferraris, showing pictures of the engine compartments, Agip oil is shown on the oil spec. plate. Usually it's the thick stuff like 15W-40 or 50. I would imagine it would cost $$$ since it's imported from Italy. I think reason not many people use it is due in part to availablity and knowledge of the oil's existence. The only time I have ever heard of this oil, is associated with Ferrari and Lamborghini.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member