Doc's Diesel 6.7L Powerstroke Filter Combo Kit for Ford F-250/F-350/F-450 (2017–2019) — Fuel, Oil & Cabin Filters

Doc's Diesel Filter Combo Kit delivers the three replacement filters—fuel/water separator, oil filter and cabin air filter—matched specifically for Ford 6.7L Powerstroke F-250 models from 2017–2019.

This kit groups together the DFD4625 fuel filter, D6128 oil filter and D3806 cabin air filter so you can complete scheduled service in one order. Each component is engineered for the 6.7L Powerstroke fitment and independently third‑party tested for particle capture and dust capacity, letting you replace all service filters without hunting for separate part numbers.

Which vehicles and years will these filters fit?

The combo is built for Ford 6.7L Powerstroke diesel engines in F-250, F-350 and F-450 trucks from model years 2017 through 2019. Use the fitment card on the product page to verify your truck’s exact configuration before purchasing.

• Designed specifically for 6.7L Powerstroke engines (2017–2019).
• Compatible with F-250, F-350 and F-450 platforms—confirm trim and options with fitment tool.
• Includes all three service filters needed for a standard maintenance interval.

How reliable are the filters and what testing supports them?

Each element in the kit has been independently tested for efficiency and dust loading to provide objective performance data. Results show 99.25% overall efficiency and a 344.2 g dust holding capacity, plus 98.76% efficiency down to 3 microns for fine particle capture.

• Independent laboratory verification of filtration efficiency and dust capacity.
• High micron retention performance to protect fuel system and engine components.
• Reduced risk of contaminants reaching critical systems when installed per maintenance schedule.

What’s included and how does this kit save time?

The package contains a DFD4625 fuel/water separator, a D6128 oil filter and a D3806 cabin air filter—matched for one application so you can service multiple systems in a single visit. That unified packing reduces ordering errors and ensures you have the right parts on hand for a full routine service.

• DFD4625 fuel/water separator for diesel systems prone to water and particulate contamination.
• D6128 oil filter sized to the 6.7L Powerstroke’s oil flow and capacity needs.
• D3806 cabin air filter to help keep HVAC air cleaner for occupants.

When should I change each filter in the kit?

Service intervals depend on your vehicle manufacturer’s recommendations and driving conditions. Typical guidance: fuel/water separators are checked every 5,000–10,000 miles (15,000 miles maximum), oil filters are usually changed between 5,000–10,000 miles depending on oil type and use, and cabin air filters are replaced per your scheduled HVAC service interval.

• Fuel/water separator: inspect 5,000–10,000 miles; replace up to 15,000 miles max.
• Oil filter: change with oil service—commonly 5,000–10,000 miles depending on service schedule.
• Cabin air filter: replace according to HVAC maintenance frequency or when airflow declines.

Who this kit is for: This combo is aimed at owners and technicians who maintain 2017–2019 Ford 6.7L Powerstroke trucks and want a convenient, tested set of service filters. It’s a practical solution for fleet managers, DIY enthusiasts and professional shops that prefer verified filtration performance and a single SKU to cover routine maintenance needs.