MAHLE 224-3985WR-0.25MM PISTON WITH RINGS (.25MM) FOR 11-16 GM DURAMAX

Product Description

Step up your LML/LGH build with the MAHLE 224-3985WR-0.25MM piston with rings set for the 2011–2016 GM 6.6L Duramax. This +0.25mm (.010") oversize, reduced-compression piston pack is designed for tuned tow rigs and hard-working trucks that need more cylinder pressure headroom without giving up OE-level reliability. Coated skirts help cut friction and scuffing, while the matched ring pack keeps your Duramax sealing clean under heavy load.

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Fitment

• 2011–2016 Chevrolet Silverado 2500HD / 3500HD – 6.6L Duramax LML
• 2011–2016 GMC Sierra 2500HD / 3500HD – 6.6L Duramax LML
• 2011–2016 GM 6.6L Duramax LGH fleet, cab-chassis, and van applications (Express/Savana – verify by VIN)

Cross-Reference / Alternatives (Mahle on CPP Diesel only)

• MAHLE 224-3935WR PISTONS W/RINGS (STD) FOR 11–16 GM DURAMAX
• MAHLE 224-3935WR-0.25MM PISTON WITH RINGS (.25MM) FOR 11–16 GM DURAMAX
• MAHLE 224-3935WR-0.50MM PISTON W/RINGS (.50MM) FOR 11–16 GM DURAMAX
• MAHLE 224-3935WR-0.75MM PISTON W/RINGS (.75MM) FOR 11–16 GM DURAMAX
• MAHLE 42160 PISTON RING SET (STD) FOR 11–16 GM DURAMAX
• MAHLE 42160.01 PISTON RING SET (.010) FOR 11–16 GM DURAMAX

Notes

Price at CPP Diesel is for a complete set of eight (8) pistons with rings. Block must be bored and honed to +0.25mm (.010") with the correct finish for coated skirts and modern ring packs. Always verify compression ratio changes when combining these reduced-compression pistons with head work, gasket thickness changes, or big turbo/injector packages.

FAQ

Is the price for one piston or a complete set of 8?

The CPP Diesel listing for MAHLE 224-3985WR-0.25MM is for a complete set of eight (8) pistons with rings for your 6.6L Duramax.

What oversize is MAHLE 224-3985WR-0.25MM?

This part is +0.25mm overbore (approximately .010"). Your machine shop must bore and hone the cylinders to match this oversize and verify piston-to-wall clearance.

Will these fit my 2011–2016 LML or LGH Duramax?

Yes. These pistons are engineered for 2011–2016 GM 6.6L Duramax LML and LGH engines used in Silverado/Sierra HD pickups and select Express/Savana and fleet applications. Always confirm fitment by VIN or engine code.

Do the pistons come with rings installed?

MAHLE supplies this kit with a matched ring pack for each piston. Rings may be installed or boxed depending on MAHLE packaging, but you should always check and set ring end-gaps during assembly.

Are these reduced-compression pistons?

Yes. The 224-3985WR family is a reduced-compression design intended to give tuned and towing builds more cylinder-pressure margin while maintaining strong street manners and cold-start performance.

Specifications for Mahle 224-3985WR-0.25MM