I often hear companies conversing about the relative pluses and minuses of the more recent API CJ-4 rated oils vs. the CI-4 rated diesel engine oils that came before. As a result, it seems that it would be a good idea for us to clarify a few things about the differences between the two oil types.
It is common to hear individuals talking about the relative positives & negatives of the CJ-4 vs. the older CI-4 diesel motor 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.
