Here is an interesting web site, which discusses GM's equivalent of MB's FSS.
My PERSONAL plan is to follow the factory service intervals, no more, no less, with all my vehicles, including the motorcycles.
I also expect to pay for proper maintenance and repair, and that eventually they will all wear out.
I also DON'T expect the long life of Larry Bible's cars, as Michigan climate isn't quite as kind to cars.
Enjoy 'em while you can.
'96 E300D 60k mi (wife's daily ride)
'95 Audi 90 120k mi
'92 GMC Suburban 139k mi
'85 300SD 234k mi (my daily ride)