Why no CI/CH-4 diesel rating on Mobil 1?

[TSoA]

Just wondering, if HDEOs & diesel oils are so great, why doesnt Mobil 1 meet those specs too? As a quick guess, they have an outstanding diesel oil Delvac 1 on the market, why canibalize sales with Mobil 1? That is assuming Mobil 1 meets those specs at all. I am guessing *some* grade of M1 does.

Do other high-performance SL synthetics meet CI/CH-4 or does it only go the other way? Why and what is the main difference anyway other than apparently the SAE 40 viscosity and "soot" handling? Thanks.

 

[MNgopher]

In all likelyhood, the Mobil 1 probably does not pass some of the tests (most likely the abililty to deal with all the soot) that a diesel engine oil must pass. This is likely even more so the case for the new CI ratings to deal with the new EGR valves on diesels. There isn't a need to formulate the M1 to meet that need, since it isn't the target market and there is a Mobil offering to meet that market.

On top of that, most car users see things that work in Heavy diesels and shy away...

 

[ruking77]

I use both Mobil One 5w30 and Delvac One 5w40. The Delvac 5w40 is backward compatible with Mobil One 5w30 SL/SJ ratings. From a ratings point of view the reverse is NOT true. So I would have no issues with using the Delvac One to top off the Mobil One if and when needed. Using a CI4 or CF-4 rated oil in the SL/SJ market is done very rarely, although once you have the common need, it does seem like almost a no brainer.

[ October 23, 2003, 07:04 PM: Message edited by: ruking77 ]

 

[TooSlick]

TSoA,

The short answer is that they would have to use a thicker basestock blend, a significantly different detergent/dispersant mix, and an expensive, shear stable VI modifier.

In other words, they'd end up with something much like Delvac 1 anyway. They'd also have to charge about $1.00/qt more for it; driving customers to the infamous Castrol Syntec ...

The Amsoil Series 3000, 5w-30 is SL/CI-4 rated and also meets VW 502/505, MB 229.3, ACEA A3/B3 etc.

 

[TSoA]

Kinda strange now the M1 5w-40 SUV formula is diesel rated. Maybe I am psychic or Mobil really does monitor this board

.

 

[userfriendly]

What Diesel rating is it?
Most good non-fm engine oils will meet CF.