What does '.25MM undersize' mean for these pistons?

This means the pistons are manufactured to be 0.25 millimeters smaller in diameter than the standard factory size. This is typically used when engine cylinders have been machined (honed or bored) to a slightly larger size to account for wear or to achieve a specific clearance.

What is included in this piston set?

This set includes eight pistons, along with the corresponding piston rings, piston pins, and retaining clips. It's designed to be a complete package for rebuilding your engine's piston assembly.

Are these pistons suitable for all 6.4L diesel engines?

This specific Mahle OE piston set is designed for the 2008-2010 Ford F-250, F-350, F-450, and F-550 Super Duty models with the 6.4L diesel engine. It is not CARB approved and cannot be shipped to California.

2008-2010 Ford F-250 Super Duty Piston Set

Name: Mahle OE Ford 6.4L Diesel .25MM 2008-2010 F-250/F-350/F-450/F-550 Piston With Rings Set (Set of 8)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-ford-6-4l-diesel-25mm-2008-2010-f-250-f-350-f-450-f-550-piston-t14-52916
Price: 1091.33 USD
Availability: BackOrder

Mahle OE Ford 6.4L Diesel .25MM 2008-2010 F-250/F-350/F-450/F-550 Piston With Rings Set (Set of 8)

$1091.33

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2008-2010 Ford F-250 Super Duty. Mahle OE diesel piston set with rings, .25MM undersize, for a confident engine rebuild.

Key Features

Fits 2008-2010 Ford F-250 Super Duty, F-350 Super Duty, F-450 Super Duty, and F-550 Super Duty.
This is a set of 8 pistons, including rings, pins, and clips, ready for installation.
Features compensated ring grooves for proper ring loading and oil control.
Expansion-controlled design reduces engine noise, wear, and emissions.
Pistons are .25MM undersize, intended for use with machined cylinders.
OE quality from Mahle, a leading original equipment piston manufacturer.

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Will this fit your vehicle?

Product Details

If you're rebuilding the engine in your 2008-2010 Ford F-250 Super Duty with the 6.4L diesel, a solid set of pistons is crucial. This set from Mahle OE is built to the same standards as the original equipment, ensuring your engine runs right. These pistons are .25MM undersize, which is important to know if you're machining your cylinders to match.

Mahle is a major OE piston manufacturer, and these pistons come with compensated ring grooves. This design helps ensure the piston rings are loaded correctly, which is key for good oil control and proper sealing. They also feature expansion-controlled designs. This means they're made to have tight clearances when the engine is cold, reducing noise and wear, and helping to keep emissions and oil consumption in check. Mahle makes it convenient by including the piston rings, pins, and clips, so you have everything ready to go for installation.

This set includes eight pistons, enough for a complete engine overhaul. Remember that these are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.