11 Frequently Asked Questions Concerning Retrofit Programs Drivability Properly selected retrofit technologies do not impair driving performanceProperly selected retrofit technologies do not impair driving performanceMaintenance Oxidation catalysts and partial flow filters are virtually maintenance freeOxidation catalysts and partial flow filters are virtually maintenance free DPFS require very little maintenance (infrequent ash removal)DPFS require very little maintenance (infrequent ash removal) Effects on Engine Life Properly maintained engines and retrofit control systems do not shorten engine lifeProperly maintained engines and retrofit control systems do not shorten engine life Fuel Penalties –Most oxidation catalysts have no effect on fuel consumption –Most filters have no effect on fuel consumptionWarranties –Manufacturers provide various warranties as part of a purchase agreement Cost Considerations –DOC ($ ) –DPF ($ )
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