Advance auto parts has Mobil drive clean and Exxon Superflo on sale for $1.08 a quart.This store is 2 miles from my house.Ten miles further is a Wal-Mart that sells Chevron Supreme for $1.14 a quart.I usually use Chevron Supreme 10W30.Is the Mobil or Exxon as good or better then the Chevron? Or is the Chevron worth the drive?