Quote Originally Posted by Chris View Post
Thinner oils are great for efficiency- extracting that last MPG out of your car. You can unleash a few more horses out of your engines running lighter oils as well. But you sacrifice protection.

If you've been using Mobil 1 for 20 years, 10 years or even 5 years, the stuff in the store today isn't the same as what you were using back them. The EPA has restricted the additives allowed to be used in automotive oils. So the formulations have changed.
Thanks Chris,
But if this is a sign of things to come (heavier weights going away) is there much of a difference between 10-40 and 15-50? I've never been a believer in additives (Lucas,Zmax etc) (http://www.epinions.com/content_2969477252) what can be done. Mobil 1 was one of the last 15-50's out there....

Randy