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Discuss Whether or not to Choose an API CI-4 or CJ-4 Rated Diesel Motor Oil?

By: Michael Kaufman

It is common to hear individuals talking about the relative positives & negatives of the CJ-4 vs. the older CI-4 diesel oils. So, it seems worthwhile to layout the relative similarities and differences between using diesel motor oils that meet each of these respective API classifications.

Quite a few folks are wanting to purchase our 15w40 viscosity AMSOIL synthetic diesel oil. Generally, this is either because they fear moving to a "lower" viscosity 5w30, 10w30, 5w40 or 10w40 oil or because they've heard horror stories regarding the new CJ-4 rated oils.

CJ-4 Rated Oils Suffer from Key Additive Reductions

We want our customers to know that, our AME 15w40 oil has not been blended to meet API CJ-4 specs because in order to meet CJ-4 classification requirements motor oil producers were required to make significant reductions in the levels of key additives in fighting acid - and thus corrosion within the engine (TBN was lowered).

Are Oil Drain Intervals Shortened?

As a result, it is assumed that the long oil change abilities of API CJ-4 oils should be much less as compared to the older CI-4 oils with higher TBN values in order to blend a diesel engine oil that is more likely compatible with Exhaust Gas Recirculation systems found on 2007 and newer diesel vehicles.

Exhaust Gas Recirculation units installed on 2007 model and newer diesels are leaving very HEAVY soot load on the lubricant in the crankcase. This has necessitated an increase in detergents and dispersants in the new CJ-4 oils - keeping things clean is always a good thing.

Moreover, lesser quality CI-4 oils (those using petroleum or lower quality synthetic basestocks) have been forced to make improvements to their base stock quality in order to successfully meet CJ-4 specs. As a result, the API CJ-4 oils are, in respects to their basestock, a more advanced motor oil. However, if you are making comparisons between premium SYNTHETIC CJ-4 rated oils, the basestocks are likely pretty similar to their CI-4 precursors since the original basestocks were likely already able to meet CJ-4 classification requirements.

In actuality, in most respects, API CJ-4 rated diesel oils offer better performance than oils meeting only the CI-4 or CI-4+ classification. In actuality, the shorter drain interval possibility is really the only potential drawback to moving from a CI-4 to a CJ-4 oil. Of course, it's a pretty good bet that, if you don't often take your oil to the limit of it's drain interval capabilities anyway, you probably won't notice this difference between the two oils..

It is actually quite common for diesel owners to drain their oil long before it is necessary. In most cases, this is simply because they fear that longer drain intervals will not effectively protect their expensive engines. So, 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. If these initial oil analysis results are proven true by continued field testing, we MAY find that CJ-4 oils are able to offer oil drain intervals similar to higher TBN CI-4 oils.

In the end, if you don't intend on trying to take your oil to the max drain intervals possible, it's likely that you won't notice the drain interval difference between the two oils. Even better, wear protection and detergency of a CJ-4 oil can only help make the switch to a CJ-4 oil a beneficial one. Hence, for many companies and individuals owning diesel engines, the API CJ-4 rated oil could be the better oil, even if you don't own a 2007 or newer diesel engine.

Article Source: http://www.bigfreearticles.com

About the Author:
To find more information as regards CJ-4 synthetic diesel oil (and CI-4 rated oils) as well as a number of other filter & lube industry related articles & FAQs please visit my BestSyntheticOil.com AMSOIL website.

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