[cnavarro]

We're still using and recommending Driven DT50 for most, if not all aircooled Porsche 911 engines for street use.

For track use we still use Driven XP6.

Driven's GP-1 20w50 is a suitable replacement for the old Brad Penn, the only difference being that Driven uses a fairly hefty dose of MoS2 (Moly) in this formulation which helps to drop oil temps substantially. In fact, GP-1 is made by ARG (American Refining Group) in Bradford, PA for Driven.

I personally use all these products in my own personal cars and continue to see used oil analysis results that back up how well these oils are working in our engines.