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Message: [QUOTE="CATDiezel, post: 1128468, member: 4387"] Carbon is less abrasive than wet fuel hanging on the cylinder walls. SCR and urea is worthless below 600*F for a proper change I'm state to ammonia to attach itself to the nitric oxides and dioxides. For a scr/dpf/doc to function properly it's best to always be above 600 and that is just the tip in point. Ideally 750+ is great to maintain a very clean system. Since you work for caterpillar I can give you the product number for an excellent read on EGR/SCR/DPF. IF your interested when I get off vacation. You can find it yourself if you have permissions granted to all cat websites. Engines.cat. (whatever the replacement is for it now) can be found in the search function for literature. [/QUOTE]

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