If it means anything, Mobil is advertising that Porsche uses Mobil 1 in all
the vehicles that it manufactures.  I think that this is what dealers use
also.  I've been using Mobil 1 in my '92 Jetta GLi (96K) and our '88 Vanagon
GL (92K)  for a long time.  I drive them both hard (after warm-up) and have
had no oil related problems.  I think that Mobil 1 is  probably as good as
you can get.

Gary
Sticking out in Fairfield County, CT 'cause I don't drive a Beeeeeeemer!

>I know this is like which ice cream flavor is best, but after investing
mucho
>bucks into a new engine, wondering if anyone has any ideas on which oils
might
>serve me best. I live in Michigan where it gets plenty cold and also plenty
>hot in the summer. In the past I have run 40w in the summer and 30w in the
>winter. I have been thinking about switching to Mobil One 15W50