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#2304537 - 07/02/11 08:50 PM Mobil 1 vs ACDelco dexos synthetic blend
BIC Offline

Registered: 07/02/11
Posts: 1
Loc: Kansas
I have a 2010 Cadillac CTS 3.6L. OEM oil is Mobil 1 5W-30, says so in the manual and on the cap. Brought it to Cadillac dealer assuming they would put Mobil 1 in. Reading invoice after the fact, it said, "dexos syn blend oil." Presumably it was GM's own ACDelco. Dealer said that was now the recommended oil.

I called another Cadillac dealer and asked what they would put in and he said Mobil 1 and that the dexos syn blend was a money saving alternative ($60 vs $80).

While I understand that dexos is fine, I want what's best, not just OK. Intuitively, it seems to me that fully synthetic Mobil 1 is better than GM's syn blend. On the other hand, if they're equal, wouldn't mind saving a few dollars either. Interestingly, if that same 3.6L engine is in a Chevy or a Buick, it did not call for Mobil 1 in 2010. Any thoughts out there?

Second question. I drive low miles, maybe 5,000 per year. When I hit the one year mark, the OLM still said I had about 70% life left but I changed it anyway at about 2,000 miles (first oil change). Any other recommendations other than changing it yearly regardless of OLM life left? Same for Mobile 1 or dexos syn blend?

In my low mileage cars (2k-3k per year) with conventional oil, I change every six months. Is that OK? Thank you.

#2304541 - 07/02/11 08:59 PM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
tig1 Offline

Registered: 01/03/09
Posts: 11710
Loc: Illinois
Chances are the OLM is designed for M1 full synthetic not a blend or dino. If the dealer said the blend was now the reccomended oil, I would have him check with Cadillac and see if they got the memo.
2007 Ford Fusion 190,000 miles
M1 0-20 AFE
2007 Ford Focus 161,000 miles
M1 0-20 AFE
10,000 mile OCIs on both engines
M1 10-30 in all OPE
MC filters

#2304554 - 07/02/11 09:19 PM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
dishdude Offline

Registered: 11/14/08
Posts: 6869
Loc: Phoenix
Dexos supersedes all previous GM oil specs, so you are good to go!

#2304566 - 07/02/11 09:37 PM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
daves87rs Offline

Registered: 02/23/09
Posts: 15957
Loc: Michigan
Sounds stange....but I think that dexos blend would be fine...
Whatever you are, be a good one.

#2304620 - 07/02/11 11:18 PM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
wallyuwl Offline

Registered: 06/02/09
Posts: 1651
Loc: Lexington, KY
For your mileage, changing with the blend at one year intervals will be fine.

Try calling different GM dealers for their oil change prices. $60 for a blend and $80 for M1 seems high. Here M1 is $60 at the local Chevy dealer.

You could also change it yourself for about $30 per oil change with a synthetic.

#2304631 - 07/02/11 11:53 PM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
Lead Shoes Offline

Registered: 03/03/10
Posts: 2433
Loc: Mn
At my local GM dealership its about 50 for a M1 oil change... I would not be super pleased about the unknown blend being in my new car.. the best way to make sure the right thing gets in there is to do it yourself..
1992 BMW 325i 183k
Castrol 0w40/Mahle
1999 BMW M3 97k

#2304646 - 07/03/11 12:27 AM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
229 Offline

Registered: 06/23/11
Posts: 722
Loc: Mid Atlantic
Your oil change intervals are fine. The Mobil1 is a superior oil because it also has HTO-06 approval. The ACDelco is good to use also, he may be using bulk for it and bottled now for Mobil1 as he has adjusted his inventory.
Eneos Dealer

#2304686 - 07/03/11 02:53 AM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
The Critic Offline

Registered: 08/30/04
Posts: 18927
Loc: Walnut Creek, CA
Both products are on the GM approval list for Dexos 1. So in GM's eyes, they are exactly the same.
11 Prius, 138k, M1 EP 0w20
07 Accord I4, 114k, M1 EP 0w20
10 Altima 3.5, 36k, M1 EP 5w30
92 Previa, 162k, Chevron 5w30

#2304701 - 07/03/11 05:46 AM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: dishdude]
LexusAussie Offline

Registered: 01/04/08
Posts: 215
Loc: Sydney, NSW, Australia
Originally Posted By: dishdude
Dexos supersedes all previous GM oil specs, so you are good to go!


It's a GM Approved Oil, used by a GM Dealer. What's the problem? There are multiple brands of oils that meet the Dexos spec. Mobil 1 is only one of them.
Dave "Dave's not here man"
2010 Lexus RX350 Sports Luxury, 2006 Lexus SC430
AMSoil Series 3000 HDEO 5W-30
BMW's are German Chevy's

#2304709 - 07/03/11 06:50 AM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
gulian Offline

Registered: 12/06/09
Posts: 83
Loc: canada
I wouldn't wait more than a year to change oil regardless to how many miles on it, as it contaminates due to time. As far as the acdelco versus m1, I would think full synthetic would be better in the long run and it's cheap insurance. That's the direction I chose and my vehicle requires a dexos1 oil. Little is said here at bitog about AcDelco oil's durability.

Edited by gulian (07/03/11 06:51 AM)
Edit Reason: point added

#2305104 - 07/03/11 03:14 PM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
Durango Offline

Registered: 02/15/07
Posts: 2075
Loc: Los Angeles, California

At my brothers Caddy dealership they use Castrol "Syntec" instead of GM/Mobil 1 instead. So tht bing said not all GM dealers go by what the factory says. I'm pretty sure Mobil 1 and Syntec are about equivelant in quality.

I had thought that GM's version is the same as Mobil 1 "Dexos" as I understood it.


#2335220 - 08/02/11 12:57 PM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
MonumentOiler Offline

Registered: 02/04/07
Posts: 442
Loc: Monument, CO, USA
I'd go to one year intervals with your low yearly mileage cars too. Conventional oil will be fine over the year.

Oil does not contaminate over time the way brake fluid does and if you are changing the oil at 70% of life left definitely go with the cheaper change as long as it meets specs.

Yearly changes are best done in the spring after all your winter cold starts.

#2335227 - 08/02/11 01:04 PM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
Xstang Offline

Registered: 04/13/11
Posts: 244
Loc: Kansas
I wonder how much exxonmobil paid to get that printed on you oil fill cap.
2003 Subaru WRX
Rotella T6 5w-40-PL14460
2003 Camry
Whatever is cheap smile

#2335409 - 08/02/11 04:16 PM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
Finklejag Offline

Registered: 11/23/03
Posts: 1522
Loc: WA
I did a Virgin oil analysis on the ACDelco Synblend 5W-30. It's made by Mobil and has a very good additive package. The ACDelco oil will be fine for one year oil changes in your car.

2016 Audi A3 2.0T Quattro

#2335416 - 08/02/11 04:19 PM Re: Mobil 1 vs ACDelco dexos synthetic blend [Re: BIC]
someguy Offline

Registered: 09/10/10
Posts: 252
Loc: Austin, TX
Here is a VOA on that dexos 5W-30 with some discussion on its origin

A $60 oil change seems expensive for a oil change from bulk blend but its a Caddy so I guess that makes everything cost extra. I would never go over a year on any oil regardless of mileage or frequency driven.

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