Guys,
Is it OK to run CJ-4 NOT RATED synthetic oil in LMM? In this case it would be AMSOIL 15W-40.
Thanks,

I'm not sure I understand the question, but you MUST run CJ-4 in a stock LMM

CJ-4 only with a DPF equipped diesel.

ok you have to run CJ 4 on account of the diesel particulate filter, if not you create an issue with regen process. any synthetic oil HAS to meet the correct API rating. If you are inquiring about AMSOIL i just reviewed their 1540 deo and i dont see an API rating sufficient to meet the LMM's needs. Hey bud safe bet is to not use anything unless coined with API CJ4

amsoil has approved oil.

I have no confidence in amsoil, the crank in my boats 454mag had scuffs on the crank with amsoil 20w50 racing oil. now using valvoline 20w50 vr1 racing oil......

If you're going to run Amsoil in your LMM then choose the Amsoil DEO which meets CJ-4 spec and is 5w-40

If you remove your DPF, do you still need CJ-4 oil?

nope

Beware! most AMSOIL products are not API rated they just want you to think they are. They will say "Meets API specifications" no API symboil on the bottle.

Beware! most AMSOIL products are not API rated they just want you to think they are. They will say "Meets API specifications" no API symboil on the bottle.

Having the symbol on the bottle or not does not really mean much.
Several oil manufacturers that either produce the oil or bottle the oil do not put the symbol on their bottles. I have some API Honda oil without the symbols on the bottles. I also have some Mobil 1 and Pennzoil in my garage right now that do not have the symbols, only the API spec's for the oil.
So the above warning is without merit............

Rated and certified are two TOTALLY different subjects

As far as I know, from 06 to current duramaxes use Rotella triple guard w/ CJ4.:cool: Use it in anything w/ a convertor and DPF.

I disagree if you were in the engine design business an oil that is certified ensures you have an oil that is at the rated operational specifications rather than having an oil that is claimed to be at the rated specification. In this day of high temp and high stress engines that means a lot. As much as AMSOIL and other synthetic producers charge for their oils then they should spend the time to get the evaluation and the certification. If they cannot meet the certification standard then rated really means we thought we had it but the API which set the standard says we do not. The Engine Oil Licensing and Certification System which is the daddy of the API symbols is voluntary and cost them very little to obtain the certification compared to the money they make selling the product. Most of these custom oil companies refuse to even obtain an ISO/TS 29001 certification for producing their products which should make people leary of using their products. The reason for the CJ4 certification has to due with the amount of sulfur in the oil vs contaminating the EGR system and DPF in case it needs clarified. BTW if your manufacturers manuals state the oil MUST BE CERTIFIED then a manufacturer may deny a warranty claim due to the requirement unless YOU PAY for the certification and testing of the oil and drag it through court to prove otherwise.

It currently cost $750,000 - $1,000,000 to have oil certified by API. Each and everytime a manufacturer changes the formulation the oil has to be recertified. Amsoil being a privately held company doesn't have the cash to do this, since they are constantly updating their oils with the latest and best baseestocks and additives. Their oil is however tested by Amsoil and third party testing labs to ensure the oils meet and in every case exceed the standards set forth by API. The large majority of oil manufacturers that pay for certification are publicly held companies(look at your mutual fund prospectives) and still just manufacture their oils to meet the Minimum standard.
Again being certified and rated are two totaly different situations.
I might add the using quality oil and filtration and having oil analysis completed on a regular basis, gives historical data that is hard to refute if the lubricant is (thought) to be at fault.

It currently cost $750,000 - $1,000,000 to have oil certified by API. Each and everytime a manufacturer changes the formulation the oil has to be recertified. Amsoil being a privately held company doesn't have the cash to do this, since they are constantly updating their oils with the latest and best baseestocks and additives. Their oil is however tested by Amsoil and third party testing labs to ensure the oils meet and in every case exceed the standards set forth by API. The large majority of oil manufacturers that pay for certification are publicly held companies(look at your mutual fund prospectives) and still just manufacture their oils to meet the Minimum standard.
Again being certified and rated are two totaly different situations.
I might add the using quality oil and filtration and having oil analysis completed on a regular basis, gives historical data that is hard to refute if the lubricant is (thought) to be at fault.

I read recently that it only costs 1,000 to 1,500 for the API license. Made me mad as hell thinking how cheap AMSOIL is for not getting it.

BigDaddyG I recently went through the certification process for an additive took about 9 mos and cost me only 7300 + 3900 total. The 750K to 1M figure I have no clue unless it it something special to amsoil but mine was an oil additive for marine use and I just completed the licensing procedure. The cost related to my application was about 1300 for a non member license application and around 5900+ for an independent test. Now I have to wait for my study to be complete from another source to ensure I am not infringing upon a patented formula which is costing me another 3900. Here is the application I used while applying.

I used this as a guide I went back to my emails and found this link but did not try it so it may not work

http://www.api.org/certifications/engineoil/forms/upload/Instructions.pdf

BigDaddyG I recently went through the certification process for an additive took about 9 mos and cost me only 7300 + 3900 total. The 750K to 1M figure I have no clue unless it it something special to amsoil but mine was an oil additive for marine use and I just completed the licensing procedure. The cost related to my application was about 1300 for a non member license application and around 5900+ for an independent test. Now I have to wait for my study to be complete from another source to ensure I am not infringing upon a patented formula which is costing me another 3900. Here is the application I used while applying.

I used this as a guide I went back to my emails and found this link but did not try it so it may not work

http://www.api.org/certifications/engineoil/forms/upload/Instructions.pdf

Thanks for the info. What I had read probably didn't include any testing. What cracks me up is all the "API ratings don't really matter" yet all AMSOIL trys to do is convince folks that the oil is API certified. I just dislike the marketing scheme they use. The products seem pretty good and I run their oil filters. Just seems to be some kind of pyramid scam and they charge similar or higher prices for an uncertified product.