The Amsoil Premium API CJ-4 Oils DEO 5W-40 & DME 15W-40 have been upgraded with a higher TBN level and and now recommends 3x the OEM recommended drain interval.

This is great news for those newer LMM, Dodge 2007+, and Ford 6.4 PSD owners. Not wanting to start an oil debate just want to keep you all up to date on the latest news from Amsoil. :thumb:

Here is an article for you,

One Voice Q&A (https://www.amsoil.com/dealer/onevoice/OneVoice_DieselOils.pdf)

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What was the TBN of the "old" stuff?

What was the TBN of the "old" stuff?

The old stuff started at 8 TBN.

Zowie! 3x the OCI? That's moving up there! Where's the TBN of the "new" stuff at?

It's at 10.4. The product code on the 15W-40 is DME. As of this am they haven't even posted a product page yet on it.

That's much more on par with it's competitors. The 8.x was a bit under the others.

Although, most don't realize that TBN is not near as important as it once was. With the ULSD becoming very widely distributed (and LSD hard to find, in my area) that TBN just isn't as needed.

Still - it's apparent that Amsoil saw fit to increase it a bit, to the tune of 3x the standard OCI. Now, is it still limited to 25k miles with use of EaO filters in "normal" service, or have they bumped up the mileage as well?

Good point, if the OEM interval is 10k, I'd read that as a 30k guarantee???

That's much more on par with it's competitors. The 8.x was a bit under the others.

Although, most don't realize that TBN is not near as important as it once was. With the ULSD becoming very widely distributed (and LSD hard to find, in my area) that TBN just isn't as needed.

Still - it's apparent that Amsoil saw fit to increase it a bit, to the tune of 3x the standard OCI. Now, is it still limited to 25k miles with use of EaO filters in "normal" service, or have they bumped up the mileage as well?

They actually changed the miles/hours on it to be that 3x not to exceed 50k miles or 600 hours I think it was. The draw back is the filter (to my knowledge) is still only rated for 25k so you would need to be changing the filter in anything beyond 25k. I think most OEM specs for our light trucks are 7500 so that still stays under the 25k. They also state that UOA beyond the 50k mile limit using ONLY Oil Analzers as the lab would be acceptable to extend past the 50k mile limit.

They actually changed the miles/hours on it to be that 3x not to exceed 50k miles or 600 hours I think it was. The draw back is the filter (to my knowledge) is still only rated for 25k so you would need to be changing the filter in anything beyond 25k. I think most OEM specs for our light trucks are 7500 so that still stays under the 25k. They also state that UOA beyond the 50k mile limit using ONLY Oil Analzers as the lab would be acceptable to extend past the 50k mile limit.


I missed that. I didn't read it very well. That's interesting that they've stretched it out some. As Dave has always talked about, the ULSD must be playing a vital role in sustaining the oils these days.

Take the sulphur out of the fuel, and the resultant byproduct action of acid production goes way down. That makes for much less need for TBN. We've moved from 500ppm to 15ppm, IIRC. That's a huge reduction in sulphur and the associated aromatics.

Remeber when diesel used to stink? It was something like 3000ppm of sulphur. I had a small diesel Escort back then, and would pump fuel with gloves on to keep the stench from my hands.

Then we went to 500ppm.

Now we're at 15ppm. Not much left. Fuel still smells "oily" but not reeking of rotten eggs like years gone by.

All this help the oil last MUCH longer.

Amsoil is once again leading a heady charge!