What about these new mobil synthetic oils?
http://www.mobiloil.com/USA-English/...rformance.aspx
15,000 miles reccomended by the oil manufacturer
http://www.mobiloil.com/USA-English/..._Warranty.aspx
7500 miles
http://www.mobiloil.com/USA-English/...lean_5000.aspx
5000 miles
These 3 oils are marketed by the oil companies to last longer... I wanna know what their deal is.
Here is the listing of severe according to mobil.
Upon what driving conditions are these performance claims based? Normal or severe driving conditions?
These claims relate to all typical consumer driving conditions, excluding those mentioned below. In other words, if you drive under normal conditions and use Mobil 1 Extended Performance in your vehicle, the oil is guaranteed to protect your engine for 15,000 miles. We also recommend that drivers consult their owner’s manual while their vehicle is under warranty, and follow the guidelines set forth there. Additionally, we recommend that if consumers drive routinely in severe conditions that they follow the oil change interval recommended in their owner's manual for severe conditions. We define "severe conditions" as:
#1 racing or commercial applications;
#2 frequent towing or hauling;
#3 extremely dusty or dirty conditions; or
#4 excessive idling.