The guy's article is about half good base knowledge and about half B.S.
Is CJ-4 oil actually inferior in any way? Show me the science. Show me the test results, not guesswork based on the amount of certain additive compounds. Show me how these additives in these quantities work together or fail to work together.
Here are the tests required to pass CJ-4:
http://www.apicj-4.org/performance_specs.html
Here are the tests required to pass CI-4 & CI-4+. These are all real world tests on real test engines using lab measurements.
http://www.infineum.com/information/api-heavyduty-ci4-2004.html
Show me how the results in CJ-4 testing is inferior to CI-4 results.
Also:
Quote:
Today I would avoid any oil which utilized Group I (and preferably Group II) base stocks. Today’s engines need better oils than that! Group III and Group IV base stocks give the kind of performance (Group III mineral oil and Group IV synthetic) you need in your truck. Group V stocks aren’t really needed here unless you have money to burn.
Well, duh. You won't find Group III (generally accepted as synthetic) base stock in any 15W-40 oil. You will find Group II or Group II+, which the guy ignores. Group III and Group IV (PAO) base stocks are the synthetic base stocks which he said are generally a waste of money.
Quote:
Finally, don’t fall for the statement that synthetics can be cost justified because they can be used for twice the normal oil change interval. This is simply no longer true. The additive package, particularly detergent, dispersant, and antioxidant levels, is the primary determinant of oil change interval. Also consider that extending oil change intervals is a gamble. You can monitor used oil data to determine if suffi cient additive is present to continue, but one of the main reasons to change oil is to get contaminants (soot, sludge, etc.) out of your engine. Some contaminants, such as glycol, can cause a lot of damage in a short time.
The remaining levels of additives available to work in the engine is one major determinant of the remaining life of the oil. As he states, there are better (costlier) additive packages available to the oil blender which provide longer oil life. Another is the level of oxidation. Better base stocks have longer life before they oxidize, and there are better (costlier) base stocks within a Group number which live longer. Sludge is mainly a result of either oxidation or contamination from coolant, etc. If the oil is contaminated with coolant, fuel, or any other foreign material, the oil must always be changed immediately and the source of the contamination found and fixed--this has exactly zero relationship with the life of uncontaminated oil.