Oh no. Not another oil thread.

Basically for an FSS car, if you're going to follow the FSS intervals you MUST use synthetic of a weight that matches your climate conditions. Most folks believe that you should change it a little more often than FSS intervalse even if you use synthetic.

If you use regular dino oil, it has been PROVEN that changing on FSS intervals is not often enough. There was even a lawsuit that came about because people were using dino oil, changing at FSS intervals that caused their engines to crud up like crazy.

It's your car, your money and your business, but oil is cheap and engines are expensive.

Good luck,
Change oil hot and change oil often,