Sinister Diesel Injector Seal Kit – 6.0L Powerstroke
Fits 2003–2007 Ford F-250 & F-350 Super Duty, and 2003–2005 Ford Excursion
Key Features
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Complete injector seal and O-ring kit – everything needed for a full injector reseal
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Restores proper fuel system sealing to prevent leaks and contamination
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Eliminates common 6.0L issues like fuel dilution in oil, hard starts, and poor injector performance
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High-temperature, diesel-rated materials – built to handle extreme heat and pressure
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Direct-fit design – no modifications required, works with all OEM and aftermarket 6.0L Powerstroke injectors
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Meets or exceeds OEM specifications for long-lasting reliability
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Backed by Sinister Diesel’s quality and customer support
Reasons to Upgrade
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Over time, the factory injector seals on 6.0 Powerstrokes break down due to heat, pressure, and fuel exposure — leading to internal leaks, oil contamination, and reduced performance
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Replacing those seals with Sinister Diesel’s premium kit restores proper sealing and injector efficiency, keeping fuel and oil where they belong
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Whether you’re installing new injectors or servicing your existing set, this kit ensures your injectors perform like new and remain leak-free under all operating conditions
Product Description
The Sinister Diesel Injector Seal Kit is an essential upgrade for maintaining reliability in your 6.0L Powerstroke. Designed as a direct replacement for worn or leaking factory seals, this kit includes all the O-rings and sealing components needed to reseal all eight injectors.
Manufactured from high-temp, fuel-resistant materials, these seals withstand the harsh environment of a diesel engine—protecting against leaks, cross-contamination, and combustion gas intrusion. The result is smoother performance, consistent fuel delivery, and restored engine efficiency.
Whether you’re a DIY mechanic or a professional shop, this kit provides a dependable, factory-quality repair that ensures your 6.0L Powerstroke runs clean, strong, and leak-free.
Kit Includes
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Complete set of injector seals and O-rings for all eight injectors
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Installation-ready, direct-fit components
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Instructions for proper seal replacement procedure
Why Buy From Sinister Diesel
Since 2009, Sinister Diesel has been the trusted source for Powerstroke performance and reliability parts. Our injector seal kits are precision-manufactured to meet OEM standards and tested for long-term durability. With fast shipping, knowledgeable support, and a focus on quality, Sinister Diesel helps keep your 6.0 running like it should — strong, clean, and reliable.
