Scroll down this link to the Mobil1 Diesel oil formulations Chart.

Interesting to see what other Mobil1 motor oils are in the same category as the Mobil1 0w40.

http://www.mobiloil.com/USA-English/Mot ... Myths.aspx


Mobil1 high mileage 10w40 considered as a diesel oil?

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

Every oil that I have looked at for sale in the UK can be used in diesels.

If you check the data sheet for European oils you will see that Mobil 1 0w40 Turbo Diesel is exactly the same as Mobil 1 0w40 New Life.

At least the data sheets are identical.

If you are able to cross reference with the equivalent European oil you can see that even a cheap conventional oil like 15w40 GTX is specced as A3/B3.

Most oils are A3/B3/B4 and energy conserving oils are either A1/B1, A5/B5 or better quality oils are usually A5/B5, semi synth tends to be just A1/B1.

I always used to buy diesel oil but for the past four or five years it is no longer that important.

HDEO's are obviously a different kettle of fish altogether.

In the UK at least they seem to be specced for Diesel engines only.

Racer, Euros stopped using API (american petroleum institute) oil specs in the early 1990's. There is no difference in designation between spark and compression ignition oils there.

The 'myth' M1 continues to propagate is that CJ-4 is backwards compatible. It's Euro rating is ACEA E9. . . that is for vehicles with DPF (diesel particulate filters). CI-4 oil is compatible with EGR. . . ACEA E7. The detergent and lubricity qualities of the two specs are not the same.

HDEO (heavy duty engine oil) seems to be generally heavier oil. Thus Delvac 1300 is spec'd. (Sam uses/used Delo 400 15/40 dino with no ill effects)

The ultra low viscosity is a big no-sale with me. I'm running AMO 10/40. It's below zero here nights and my engine seems to start more easily than it did with RT6.

Ya pays yer money and ya takes yer chances.

PS There has long been a discussion about completely revamping the viscosity index ratings. That is because they mean almost nothing.

PPS I reread the above M1 file again. It conflicts directly with other 'official' info they disperse in pdf files.

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'05 Sport CRD 107k miles. NOBODY knows everything.

I have now ran Mobil 1 0w40 New Life in the 2.5 CRD engine for 2000 miles.

I was giving the vehicle a quick check over tonight and was pleased to note it hasn't used any oil, or at least not enough to be measured.

I was surprised as I had been expecting a little usage when cold.

This is the newer SN formulation.

Very happy with that.

There are some small differences between diesel and petrol engines in Europe.

Though it is a minor thing.

Some oils, more usually at the lower end of the price spectrum, are only specced for A3/B3 and not B4.

B4 i believe relates to direct injected diesels.

Not sure what the differences are, but Castrol for example do a version of GTX that is A3/B3 nd one that is also B4, from memory the former is a 15w40 and the latter a 10w40.

Don't know much about APi specs though they are handy in trying to figure out which HDEO's can be used in your diesel as some older diesels list an APi spec. And all the HDEO's I have looked at have an APi spec listed.

Could you give a link to where M1 say CJ-4 is backwards compatible with CI-4. As you rightly say they are different specs.

However when I was in contact with the Delvac distributer last year getting prices on HDEO's for the Taxi I asked for two oils in particular.

The CI-4 was Mobil Delvac XHP LE 10w40 incidentally.

But I have looked at the UK site and can't find any oils marked up as CJ-4.

There are some compatible with CI-4+, CH-4, CI-4 and backwards compatible to CG-4 and CF-4.

Is it possible that some specs have been released with some errors?

I don't think Mobil is the one saying this, but API themselves:

From API's website:

"Do API CJ-4 oils protect older engines as well as API CI-4 or API CI-4 PLUS oils?
Yes, API CJ-4 oils are designed for use in new engines as well as the existing on-highway fleets. API CJ-4 oils are qualified utilizing several new engine tests that are more severe than those used for API CI-4 or API CI-4 PLUS oils thus defining a new category of oils with much more robust performance than previous categories. API CJ-4 oils are formulated for improved wear protection, deposit and oil consumption control, soot-related viscosity control, prevention of viscosity loss from shearing, used oil low-temperature pumpability, and protection from thermal and oxidative breakdown when compared to previous API performance categories. As always, users should seek guidance from their engine or vehicle manufacturer regarding specific service recommendations."

I too have concerns about what was lost with CJ-4, but...I haven't seen any data from UOA or otherwise to back this up.

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2005 KJ CRD - EURO TC, GDE ECO-FT, GDE TRANS, Lift Pump(<- hard to install, worth it) = 32+ MPG highway and a great ride
Product & Catalog Director @ IDParts.com (888) 444-7951 sales@idparts.com http://www.idparts.com

First time trying to cut n paste on a phone so hope this works!

http://www.equipmentworld.com/side-by-s ... -plus-oil/

This link is an article about the very issue talked about above.

Specifically talks about mixed fleets looking to use one oil.

All DPF low/mid saps oil that i have checked seem to have lower TBN to start out with, but are also specced in many long drain situations so they must be designed to retain TBN, how they achieve this I don't know. Not just HDEO but also with normal vehicle oil, such as C3.

But if you look at be Acea specs you can see that low/mid saps oils, C2, C3 etc are Lso specced for A3/B3/B4.

So the fact they are also low/mid saps is not an issue, this would infer they are indeed backwards compatible.

Or am I assuming too much?