Cummins Inc announced that its Heavy-Duty ISX and ISM on-highway truck engines for 2007 will be covered by its exclusive Uptime Guarantee. For 2007, the Uptime Guarantee includes both the engine and the aftertreatment system. Under the guarantee, if a customer's ISX or ISM engine or aftertreatment system fails and can't be repaired within a 24- hour period, Cummins will not only pay for the repairs, but also provide up to three days of reimbursement for a rental vehicle, so that customers can deliver their loads.