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02-04-2013, 06:50 PM #1
Dealer Supplied Synthetic Blend Oil
I recently had my 07 Sierra serviced at the dealer where I bought it. I was told the dealers are now using only synthetic blend of oil for oil changes. The service tech could not tell me what the blend was other than being 5w-30 Dexos. Two (2) email later to the dealer and all I got back was a song and dance about the service they provide, etc. but no answer on what the blend of oil. I contacted the GMC Customer Assistnace Center and was unable to get an answer. I was told they would have to research it. All I want to know is what is the blend (%) of synthetic oil to regular oil. Can you help?
Last edited by goldie; 02-04-2013 at 06:51 PM. Reason: mispelling
02-04-2013, 07:43 PM #2
Here is the GM information, along with a list of approved 3rd party oils: http://www.gmdexos.com/home.html
I suspect the formula for each "mix" is proprietary information. Go with the full synthetic and avoid the worry.Ray
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
02-04-2013, 08:04 PM #3
Good info Ray. I guess I know why the GM tech center switch from mobile one to FUCHS. I have been running the fuchs TITAN Supersyn D1 SAE 5W-30 for the last few oil changes.
1995 Silverado 4x4
6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge
2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
2002 Silverado ext cab 2wd (Sold)
2003 Yukon XL (Totaled)
02-04-2013, 08:15 PM #4
I just switched from Castrol Edge to Royal Purple, I don't see RP on the list.
02-04-2013, 08:20 PM #5
what is funny is that less than 2 years ago GM was using royal purple at the tech center.
02-05-2013, 05:45 PM #6
@RayVoy -Thanks for the great information. I checked the site and was very pleased to see all the options for oil. I'm going to keep plugging away and if I get an answer will post here and any other thread anyone can suggest as being appropriate.
02-08-2013, 05:30 PM #7
Well, the GMC Coustomer Assistance Center replied to me and the told me they could not find the information. I sent a message through the site RoyVoy supplied and they have not replied. And, of course, no reply from the GM Customer Service folk at this thread. I truly don't know what the big deal is about this oil.
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