Restore proper cylinder sealing and oil control with the MAHLE Engine Piston Ring Set S42168. It's a direct-fit replacement for the 2011-2016 Ford F-250, F-350, F-450 and F-550 Super Duty, plus the 2016 Ford F-650 and F-750.
A piston ring set fits into the ring grooves of the engine's pistons, where the rings do the core sealing and oil-management work inside each cylinder. If worn or broken original rings are the cause of high oil consumption or lost compression, this set replaces them.
- Combustion sealing: the rings seal the piston against the cylinder wall to help contain combustion pressure.
- Oil control: designed to manage the oil film on the cylinder bore and limit oil from reaching the combustion chamber.
- Heat transfer: helps carry heat from the piston to the cylinder wall.
- Engine-specific set: supplied for the pistons of the listed engine — confirm the piece count and any additional parts needed against the vehicle service information.
Rings are installed as part of an engine rebuild or reseal; consult the service procedure for the correct sizing, gap, and installation.
Manufacturer part number S42168.
Frequently Asked Questions
What does the MAHLE S42168 piston ring set do?
Its rings seal the piston against the cylinder wall to contain combustion pressure, manage the oil film on the bore, and help transfer heat from the piston to the cylinder.
What vehicles does this ring set fit?
It's a direct-fit replacement for the 2011-2016 Ford F-250, F-350, F-450 and F-550 Super Duty, plus the 2016 Ford F-650 and F-750. See the Buyer's Guide tab to confirm your vehicle.
What are signs my piston rings may need replacing?
Blue exhaust smoke, high oil consumption, fouled plugs, and low compression can be signs of worn rings, but these symptoms have other possible causes—diagnose the cause before replacing.
Should all cylinders get new rings at once?
Yes. Piston rings are replaced as a complete engine set during a rebuild or reseal so sealing and wear stay consistent across every cylinder.
Does this set include everything needed for the job?
It supplies the piston rings for the listed engine. Confirm the piece count and any additional gaskets or hardware required against the vehicle service information.
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