Doc's Diesel 6.6L Duramax Fuel & Oil Filter Kit DGF429+D11878 — 2020–2025 2500/3500HD, OE Fitment

Doc's Diesel Filter Kit DGF429+D11878 is a complete fuel-and-oil filter set designed to fit Chevrolet and GMC 6.6L Duramax 2500HD/3500HD models from 2020 onward, replacing TP1015 and PF26 equivalents.

This filter kit bundles the DGF429 fuel filter and D11878 oil filter so you can perform a timely service without hunting for individual parts. Each filter is engineered to match OE fitment and cross-reference popular part numbers from AC/Delco, Wix, Baldwin and others. The kit simplifies maintenance, helps maintain engine protection, and keeps your Duramax running according to recommended service intervals.

How does the kit match my 6.6L Duramax's fit and parts list?

The kit is specified for Chevrolet and GMC 6.6L Duramax 2500HD and 3500HD trucks from the 2020 through 2025 model years. Doc's Diesel lists cross-references so you can confirm compatibility with the original equipment numbers you may already use.

• Fuel filter DGF429 replaces AC/Delco TP1015, Wix WF10451 and other common OEM numbers.
• Oil filter D11878 replaces GM 12684038, AC/Delco PF26, Wix WL10454, Baldwin B7449.
• Fitment declared for 2020–2025 Chevrolet/GMC 6.6L Duramax 2500HD and 3500HD models.

What performance or filtration ratings should I expect?

Doc's Diesel publishes a laboratory-tested efficiency for the oil filter and provides typical service guidance for both filters. These metrics help you judge particle capture and overall protection without overstating outcomes.

• Oil filter D11878: third-party tested at 25 micron with a 99% efficiency rating.
• Fuel filter is designed to meet typical OEM flow and contaminant-capture needs for Duramax engines.
• Both filters are built to the footprint and sealing dimensions required for direct replacement.

When should I replace the fuel and oil filters in this kit?

Service intervals depend on driving conditions and manufacturer warranty guidance; Doc's Diesel provides general replacement ranges so you can plan maintenance.

• Fuel filters: commonly every 5,000–10,000 miles; up to 15,000 miles in less severe conditions.
• Oil filters: commonly every 5,000–7,000 miles; up to 10,000–15,000 miles depending on oil type and usage.
• Always follow your vehicle manufacturer’s warranty and maintenance schedule as the final authority.

What practical benefits does buying the kit deliver?

Purchasing the paired filters together saves time and reduces the chance of mismatched parts during a routine service. It also consolidates trusted cross-references so you can replace both filters in one visit with confidence.

• One purchase contains both the compatible fuel and oil filters for a single service job.
• Covers common OEM and aftermarket cross-references for quick verification.
• Helps keep service on schedule to support engine longevity and performance.

Who is this for: The Doc's Diesel DGF429+D11878 filter kit is aimed at owners and technicians of 2020–2025 Chevrolet/GMC 6.6L Duramax 2500HD and 3500HD trucks who prefer a ready-to-install, cross-referenced replacement set. It’s useful for DIYers who want the right parts in one box and for service shops that value consistent fitment and third-party filtration data when planning routine maintenance.