WWDiesel wrote:
This subject has been discussed in great detail before and resurfaces from time to time as new members come on board!
Take aways: make your
own decisions on what is the best oil for your vehicles based on type of driving, temperature conditions vehicle will be exposed to,
and most importantly API ratings...
Here is some of the general discussions around this subject.
Mobil 1 0W-40 IS NOT AN API DIESEL RATED OIL!!!!!See this Web page for API Oil Ratings:>
http://www.api.org/products-and-service ... categoriesIt has
NO diesel API ratings! It
does not meet or have diesel CJ or CI ratings...
Mobil 1 0W-40 oil is rated: API SN, SM, SL, SJ
(all are GASOLINE engine oil Ratings!)Mobil 1 Turbo Diesel Oil is rated: API CJ-4, CI-4 PLUS, CI-4, CH-4/ SM, SL, SJ
CJ, CI, & CH are
all DIESEL engine oil API ratings!Why in the world Mopar ever recommended a non API diesel rated spec oil for a turbo-diesel engine w/EGR system is ludicrous!
(No wonder many have had rocker arm/lifter failures!)
But if you need to know, this is the Mopar Specification that superseded it:
Keep in mind, this spec oil was listed for several Mopar GASOLINE engines!
Part No. - 68171066GA
0W-40 MOPAR® ENGINE OIL, synthetic MS-SPEC: MS-12633
Specifically formulated for the needs of Chrysler SRT engines where MS-12633 is required. It may also be used in SRT engines originally recommending Chrysler MS-10725
They no longer list the MS-10725 Spec on their "Mopar International - Lubricant and Chemical Cross Reference Chart"
It is an obsolete Specification!A little more insight as to why Mobil 1 may not list the MS-10725 specification anymore:
May have been withdrawn due to a clause in their contract?
Apparently M1 0w-40 used to carry that spec in the US in the past, but no longer list it.
From another forum:
I do not believe this was Fiat's doing given that it still meets 3 Fiat specs. It has been mentioned this change took effect during Daimler's ownership.
This is possibly the result of a Non-compete clause that Chrysler placed into Mobil's Factory Fill contract.
Something along the lines of...In return for us extending exclusive use of your product in our vehicles, you agree, after termination of this agreement, to forfeit the marketing and/or approval of this specification, so that it can be exclusively extended to a subsequent party for X amount of years. Use what you wish; I simply would never run or recommend a API non-diesel rated oil in my diesels or anyone else's diesel period!
The ratings are engineering developed standards and are rated as such for a reason!Mobil 1
Turbo Diesel and several others including Rotella T6 all are good diesel oils with the correct API ratings...
We all have opinions and interpretations of all the available information!!!
But I do trust the API Ratings!
To each his own; I simply would never recommend Mobil 1 0W-40 oil to be used in any diesel engine when there are so many better choices of diesel rated oils available for the user....
what about Mobil 1 DELVAC ESP 0W40 full synthetic? I have over 15,000 Km's on on it (three oil changes worth), running great.
specs:
Mobil Delvac 1 ESP 0W-40 is recommended for use in 4-stroke diesel engines, including modern low emission engines with Exhaust Gas Recirculation (EGR), After Treatment systems with Diesel Particulate Filters (DPF’s) and Diesel Oxidation Catalysts (DOC’s). These applications include the following:
On-highway engines operating in both high speed/high load and stop-and-go conditions
Off-highway engines operating in severe low speed/heavy load conditions
High performance gasoline engines and mixed fleets
Refrigeration units
Mobil Delvac 1 ESP 0W-40 meets or exceeds the following industry and builder specifications: 0W-40
API CJ-4/CI-4 PLUS/CI-4/CH-4/SM
Caterpillar ECF-3
Cummins CES 20081, 20076
Mack EO-N Premium Plus 03
Mobil Delvac 1 ESP 0W-40
Value
SAE Grade 0W-40
Viscosity, ASTM D 445
cSt @ 40ºC 87
cSt @ 100ºC 15.2
Viscosity Index, ASTM D 2270 186
Sulfated Ash, wt%, ASTM D 874 0.99
Total Base #, mg KOH/g, ASTM D 2896 7.7
Pour Point, ºC, ASTM D 97 -45
Flash Point, ºC, ASTM D 92 215
Density @ 15ºC kg/l, ASTM D 4052 0.843
Many modern, low emission diesel engines generate more soot and operate at higher temperatures than older engines. This significantly increases the need for high performance lubricants. In addition, new engines (model-year 2007 and beyond) come equipped with After Treatment devices installed in the engine exhaust stream which will require the use of both API CJ-4 oils and ultralow sulfur diesel fuel to function properly. Further, new engines using EGR will generate even higher levels of acid, soot and heat than older EGR engines due to substantially increased EGR rates compared to previous EGR designs. Top piston rings are located higher, bringing the oil film closer to the combustion area and exposing the lubricant to severe thermal stresses.
Mobil Delvac 1 ESP 0W-40 maintains outstanding performance at significantly higher temperatures than other high performance diesel engine oils. It is also fully compatible with conventional oils. The key benefits include:
Features Advantages and Potential Benefits
Excellent for light and heavy duty diesel engines including those with EGR and/or DPFs (Diesel particulate filters) One engine oil for mixed fleet operations
Exceptional resistance to viscosity breakdown Provides outstanding wear protection
Superb soot-handling performance Helps keep engines clean
Outstanding thermal and oxidation stability Excellent resistance to sludge build-up and high temperature deposits
Inherent stay-in-grade shear stability Wear protection and reduced oil consumption; maintains viscosity in severe, high temperature service
Advanced formulation and viscometrics Improved fuel economy (vs. 15W-40 grade)
Exceptional low temperature pumpability Easy engine start-up and wear protection
Potential for extended oil-drain capability Helps to improve operating efficiency and control overall cost
this engine ran DELVAC ESP 0W40 full synthetic diesel oil for ten years
https://www.youtube.com/watch?v=ieFerSypBGc1, 800,000 MILES plus on this Detroit Diesel engine
https://www.youtube.com/watch?v=7E7Wqr26fDQ