i am looking to use Amsoil in my truck but when i go to the Amsoil website there oil says for use in pre-2007 models? Can this be used itruck? And does anyone know is there another synthetic oil out there for diesel's that is 15W-40 all i can find is 5W-40?

 

Don't worry. If you have the 5.9 it's fine. They're talking about the 2007's with the 6.7L.

 

right on thanks

 

Can't go wrong with the amsoil. Good luck.

 

Amsoil 15w-40 marine in mine and no worries!!

 

Just some clarification.

I'm guessing that choppers555 was looking at the AMSOIL AME 15w40, since this appears to be the viscosity sought. This oil dos not meet the latest CJ-4 specs because to meet CJ-4 specifications lubricant manufacturers had to significantly reduce key additives involved in acid fighting (lower starting TBN).

As a result, it is assumed that the extended drain capabilities of CJ-4 oils have been compromised as compared to CI-4 oils with higher TBN values in order to make the oils more compatible with the new EGR systems on 2007 and newer diesel vehicles.

These newer EGR systems are putting HEAVY soot load on the oil, which has necessitated an increase in detergents and dispersants in the new CJ-4 oils. In addition, low-tier CI-4 oils (petroleum based and low grade synthetics) have had to improve their basestock quality in order to met CJ-4 specs. however, if you're comparing premium synthetic oils, the basestocks are likely pretty similar to their CI-4 counterparts since these basestocks were already plenty capable of meeting CJ-4 requirements.

So, in most respects CJ-4 oils ARE an improvement over CI-4 oils. The only POTENTIAL drawback to using a CJ-4 oil is a shorter oil drain. however, if you don't take your vehicles to the limit of your oil anyway, then you won't likely notice the difference. For instance, the 15w40 is guaranteed (and I've seen it easily last) for 25,000 miles or one year.

However, MANY customers change it long before then because they don't fully trust the oil for those intervals and don't want to pay for oil analysis to verify it. Hence, even though the CI-4 15w40 oil MIGHT offer a longer drain than our CJ-4 5w40, it's likely that most end users will not notice because they never take their oil to the limit anyway.

In addition, there seems to be evidence that, although the starting TBN value of the CJ-4 oils is lower than CI-4 oils, TBN "retention" seems better with the CJ-4 oils. Thus, it is possible that, even with the lower initial TBN, the CJ-4 oils may still offer similar drain interval capability. Only time and more testing will show this for sure.

So, the end result is, If you don't intend on trying to take your oil to the full 25K/1 yr drain, it's likely that you won't notice the drain interval difference between the two oils. On the flip side, wear protection and detergency of the CJ-4 oil is going to be better. Thus, for many users, the CJ-4 oil MAY actually be the better choice, even if you own a pre-2007 diesel which doesn't require it.

AMSOIL 5w40 DEO diesel oil is our CJ-4 oil that CAN be used in all diesel engines, both older and newer - it's completely compatible with all of them.

I would not, personally, recommend a CI-4 oil, such as our AME 15w40, in a 2007 or newer diesel. Technically, it does not have the detergency properties of the newer CJ-4 oils to handle the excessive soot load that these new EGR systems are going to place on it. If you're going to stick to short drains, you'd probably get away with it, but I'm not sure it's the best recommendation.

As for the issue of viscosity, it looks like you're wanting the 15w40, which, I'm assuming is why you're shying away from our CJ-4 oil. Keep in mind that, at engine operating temperature, both oils are virtually the same viscosity. They both qualify as an SAE 40 oil at engine operating temp (around 200 degrees F). The 5w40 actually has a kinematic viscosity of 15.3 cSt at 212 degrees F, whereas the 15w40 has a kinematic viscosity of only 14.2 cSt at 212 degrees F.

Thus, at engine operating temp, technically, the 5w40 is actually a "heavier" weight oil than the 15w40. And, of course, at cold temps, the 5w40 oil will perform much better than the 15w40 will, as a result of it's 5w classification.

So, in the end, if you're looking for a heavier weight oil, the 5w40 is "HEAVIER" once the engine is up to operating temp. And, because AMSOIL uses such a high quality basestock, it's 5w40 oil will hold up VERY well in the presence of shearing forces, which means it will maintain its viscosity extremely well.

Hope that helps a bit. Sorry for the long post, but it seemed that some clarification might help.

 

thanks for that good info and clarification Mkaufman. very helpful info thanks

 

Glad to help.