The FSS actually does a reasonably good job of determining when oil and filter should be changed but only corresponds with the use of SYNTHETIC oil. MB even issued a 150,000 mile extended engine warranty to anyone who was following the FSS and using Dino oil.

So, you can use Dino oil and change it often, or use Mobil One or equivalent and change when the FSS says so. It really does work.

All that said, I'm personally a belt and suspenders type guy. I use Mobil One AND I change oil and filter between the FSS recommendation, so I am in effect, doubling up on oil changes.

Have a great day,