Just curious-
Does GM specify a particular brand and type of oil for the dealerships to use when changing oil under the maintenance agreements? I use Mobil-1 5W30 that is DEXOS certified by GM every 5k miles, and will let the dealer change per the oil minder system. It is a full synthetic. Just wondered if the times the dealer changes my oil, they would be using synthetic or not?
Thanks!
Amanda

 

Dealers will have several different oils in stock. Conventional. semi synthetic ( dexos) , and fully synthetic along with several different grades. Dealers should be putting in the recommended type and grade of oil as specified by manufacturer. Exceptions would be if owner specified something different; there would be a note and disclaimer on service ticket or repair order. As far as brands dealer will normally get his oil there either GMSPO - General Motors Service Part Operations and/or the local GM authorized oil distributor. Mobil 1 and Dexos are specified brands; conventional oil just has to meet the API specs. Oil can come in bulk ( tanker), drum, and/or cases.