Invader,
Below is a cut & paste from the web...
CI4+ is backwards compatible and benefits are seen for EGR valved motors and reduced shearing (which everyone's Blackstone reports says the 6.0L does).
All I am saying is why not use CI4+ rated oil versus regular CI4 since it was released after our trucks and manuals were printed. Heck, CI4 was a new oil rating in 2002... what evidence do you have that it is better than CH rated oil??? I do not care what kind of oil (dino or synth.), just use the best rated oil available.
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A new engine oil spec--CI-4 PLUS--hits the streets Sept. 1 this year, designed to counteract heavier-than-expected soot loads produced by some 2002 low emission engines. Yet while it’s designed to deal with conditions that are only being created by a small number of ’02 engines, the new CI-4 PLUS formulation could provide some extra benefits to older engine models as well – such as longer drain intervals and better wear protection.
One added benefit fleets may get from using CI-4 PLUS, outside of the high-soot situation founded in certain cooled exhaust gas recirculation (EGR) ’02 engines, is potentially longer drain intervals, says Alex Bolkhovsky, commercial vehicle technical advisor for ExxonMobil.
“This oil is designed to offer more viscosity control, greater soot loading capability, and better shear stability,” he says. “Shear stability and soot handling are the real benefits to a fleet trying to go to extended drains post-’02 – as well as giving them a little more peace of mind that the oil can handle the EGR environment.”
The key, says Gary Parsons, commercial automotive business unit manager for ChevronTexaco, is that oils meeting the CI-4 specification will provide extended drain capabilities in both post-’02 engines as well as older models.
“Oils meeting the spec will be less likely to shear out of grade, i.e. become too thick, which can be a major problem, as thickened oil can lead to increased filter plugging, a decrease in fuel economy, and cold start problems,” he says. “The improved soot dispersion also leads to reduced wear rates.”
Bolkhovsky stresses that, as CI-4 PLUS is fully backward compatible with other specifications and earlier generations of engines, “both older and newer engines will benefit from its use.”
CI-4 PLUS will particularly benefit those operators that have soot or shearing issues in their older trucks, he says.
“It’s especially going to offer better wear control, particularly in guarding against wear at start up, which is where most engine wear occurs,” Bolkhovsky points out. “Older trucks will definitely see a benefit and it could potentially help extend drain intervals since CI-4 PLUS has greater soot handing capability.”
