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But if you need to know, this is the Mopar Specification that superseded it: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May have been withdrawn due to a clause in their contract?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....
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve