quote:Could it be due to the dealer using a bulk conventional oil of a greater viscosity in all vehicles service there? Perhaps they use 10W-40? Just a thought.
Originally posted by ChromiumSteel: The stealership has a Mobil sign outside of the door to the service dept. After last free oil change I drained the dino and put in Mobil 1. I've kept track of every tank since new. The vehicle had 6420.2 miles on the clock at last fill.