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Now more and more attention is paid to the management of energy-saving and emission reduction. What should we do about carbon deposits?
 

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2006 WK Overland
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Welcome to the forum. In almost all cases, if your engine is in good condition and well maintained, using a good top tier fuel will usually keep the carbon deposits to a minimum. Running a good synthetic motor oil will also help. In the case of the 5.7 Hemi engines (at least the early ones), the Positive Crankcase Ventilation System (PCV) is quite inferior and will introduce and excess amount of engine oil and condensation into the intake manifold, as well as the combustion and exhaust tracts. Many folks (including me) have installed catch cans in series between the PCV Valve and the Intake Manifold to "catch" the better share of these contaminants.

Other than all of this, IMO, periodically, a few wide open throttle runs on the highway will help keep deposits to a minimum. If one putts around down like granny all the time, carbon deposits are more likely to form. So, periodic liberal exercise can be beneficial.

Also, the newer engines are closer tolerance than in the old days and, with all electronic engine management systems, better fuels/oils, and "mostly" good emissions systems, carbon deposits are normally limited when compared to the earlier "dirty engines." The biggest problem now is getting the owners/operators to properly maintain the vehicles.....not just the engine, but the complete vehicle. Just read these forums and you'll see what I mean..
 
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