Where did you get this from ? I have been trying to get info on the percentages for the various blended oils, and I can't find it any place.dwendt44 said:The GM Dexos oil is a fairly good 'blend'. AFAIK, it's 60% conventional oil + 40% synthetic oil.
I read it somewhere, on bobistheoilguy, IIRC, some time ago when the whole 'Dexos' thing first showed up. Most 'blends', even brand name ones, can change their ratio at will due to price and profit considerations; which is why the rarely, if ever, release their own mix ratios.RIT333 said:Where did you get this from ? I have been trying to get info on the percentages for the various blended oils, and I can't find it any place.
Yes, Valvoline is not on the list because they did not want to pay GM to put the logo on their oil, but in my opinion are one of the best options out there. No other company that I'm aware of will guarantee your engine 300,000 miles for free just by using their product. I'm using the full synthetic and did in my previous car as well.dwendt44 said:Any brand name synthetic oil will meet Dexos specifications; some refuse to pay GM for the privilege of being on the list.
The GM Dexos oil is a fairly good 'blend'. AFAIK, it's 60% conventional oil + 40% synthetic oil.
Most commercial 'blends' aren't that strong, but even those D.I. engines built before the Dexos specs were running on conventional oil.
It worked OK as long as you changed it at reasonable intervals.
D.I. engines are tough on oil, the 2.4L four cylinder one especially, so many are using synthetic. Some are 'blend'ing their own using the above ratio.
The 2010 model year does not require Dexo's (At least in my owners manual). Ask your dealer what proof they have that oil caused the problem.amgrass623 said:When I bought my nox in Dec 2010 and needed my first oil change in 2011, I asked the Mobil 1 shop if the oil was Dexos & was assured it is. Now that I've been having some issues with the vehicle, my dealer is immediately saying they think the problem is with the oil not being Dexos. I've double checked and the Mobil 1 shop uses the Dexos oil and this is not the cause of the rough idle that happens off and on; not always, but it could happen once or twice a month or not for two or three months. Finally got a check engine light that shows code P0690 (see that post).
Just thought I'd share. If your dealer tries to tell you it's the oil, be sure you know what your shop is using.