Although I stick by regular Valvoline 5W-30 and 3,000 mile changes in my 98 Mystique I recently found that our local Sam's Club has the Mobil 1 5W-30 six packs for about $6 less than AutoZone - around $1/qt less. I use it in my wife's GT Cruiser so I'll probably be buying it from Sam's from now on.