Help choosing the proper oil for my next change

[Boxtaboy]

I've been on Mobil 1 0W40 all this time too. Have had my Boxster for 15 yrs now. Original IMS bearing. Still running like a tiger. Why fix it when it ain't broke?

[78F350]

If you don't use Joe Gibbs Driven DT- 40 5W-40, you probably don't love your car.
I just started using Shell Rotella T6 5W-40 in a couple of mine because it works, it's readily available, and its cheap.
My favorite flavor is Castrol Syntec/Edge, but last time I was at the store it was running about $10/qt locally and that just seemed silly.

There's plenty of info on both, including UOAs fresh and at oil change. I chose what I deem as credible info from here, Rennlist, and Bobistheoilguy

I still have Mobil 1 0W-40 in my 01, but if my '99s don't explode in the next 6 months, it will probably get the Rotella too.
Heavy Duty Diesel Truck Oil in a Porsche.

[rexcramer]

+1 on Bob is the Oil Guy website. There is an amazing amount of info there.