Mobil 1 Synthetic... My Story...

[Sturmer]

Mobil 1 0W-40 or 5W-30 ?

Some winters we get low as -30C = -22F
Always used 0W-40 in all my cars.
1.8i petrol and 2,2 diesel.

[zen]

FYI:
GM no longer spec's Mobil for new Cadillac's
PI0215: Oil Filler Cap Identification and Changes - (Aug 23, 2010)


Subject: Oil Filler Cap Identification and Changes


Models: 2011 Cadillac CTS-V, DTS, Escalade, Escalade ESV, Escalade EXT, STS

2011 Chevrolet Camaro, Corvette

Equipped with Engine VINs E, F, J, P, S, T, W, 4, 6 (RPOs L37, LSA, LAU, LD8, L37, L99, LS3, LS7, LS9)




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The following information may be helpful in identifying and avoiding unnecessary parts replacement at the time of Pre-Delivery Inspection (PDI).

Condition/Concern
Technicians may notice during PDI that the oil filler cap on the 2011 vehicles no longer has the "Mobil 1®" logo printed on the cap.

Previous Design Oil Filler Cap

2519689.jpg

Revised 2011 Oil Filler Cap

2519692.jpg


Recommendations/Instructions
Important: DO NOT replace oil filler caps because they no longer display the Mobil 1® logo.

Starting with 2011 vehicle production, GM no longer specifies Mobil 1® as the required oil for the above vehicles. A new oil specification called Dexos I has been created, which a variety of synthetic and synthetic blend motor oils meet.

Note: For additional information on available Dexos 1 oils, please refer to PI0175.

• 2011 vehicles equipped with DOHC V6 engines (RPO LF1 and LLT) are no longer built with Mobil I logo caps. These vehicles should be serviced in accordance with the Dexos I standard.

• SRX models with the DOHC V6 (RPO LAU) engine used the "Mobil 1®" cap from the 2011 start of production to August 1, 2010.

• All Chevrolet Corvette and Camaro models along with the Cadillac DTS, CTS-V and Escalade models will continue to be built with the "Mobil 1®" style cap until November 2010.

[Texhawk]

I use Blackstone Labs for oil analysis.
http://www.blackstone-labs.com/

Also, Zen is correct, the owner's manual for my 2011 Camaro specifies oils meeting Dexos spec, which is supposed to exceed the GM4718M spec.
The only oils that officially meet the spec so far are Pennzoil Platinum and QS Ultimate.
I am a little skeptical that the change is not to provide more engine protection, but rather to boost gas mileage ratings, possibly at the expense of wear protection. Or go to oils that provide marginal protection and require higher cost wear additives that will increase the cost.
I think I will stay with Valvoline Synpower, or one of the other high quality synthetics until more is known about the dexos spec. If you go with Valvoline, they will guarantee your engine will not fail for 300,000 miles due to oil related problems.
Mobil 1 quality does not seem to be what it used to be, and many other synthetics on the market have now exceeded Mobil 1 performance, especially in wear protection.

[jehartley]

Originally Posted by Texhawk

The only oils that officially meet the spec so far are Pennzoil Platinum and QS Ultimate.

Valvoline and Castrol have already released statements saying they will not apply for the Dexos cert. I think GM is really messing up here by requiring it, but we’ll see. I'm sure Mobil 1 will obtain it...I don't think they would want to jeopardize the relationship they have with GM.