Shop replacement filters and CFKIT maintenance kits compatible with PACCAR MX engines used in selected Kenworth and Peterbilt trucks. Search by PACCAR OEM number, engine family, truck model or existing filter number to find available oil, fuel and fuel-water separator filters. PACCAR MX-11 and MX-13 applications can change by emissions generation, model year and engine configuration, so the truck model alone is not enough to guarantee fitment. Verify the exact engine family and product reference numbers before ordering. If your number is not listed, send Cross Filters the engine details and current filter references for a manual cross-reference check. In-stock online orders placed before 4:00 PM EST ship the same business day from Florida, with free US shipping on online orders.