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The 2007-2016 Duramax uses four filters most owners only ever change two of. Here’s what each one does, what they cost, and why the air and cabin filters are the two you’re probably forgetting.

The 2007-2009 Ram 6.7L Cummins hits a 30,000-mile mark where four filters expire at once — fuel, oil, air, and the transmission filter most owners forget. This guide prices the full kit against the dealer and the bargain brands, and shows why the 68RFE transmission filter is the one that gets skipped until it’s too late.

The 2020-2026 Duramax L5P hides a Bosch CP4.2 pump behind a fuel filter that has to work. This guide prices the full four-filter kit — TP1015, PF26, A3248C, CF185 — against the dealer and the bargain-bin brands, and shows why the fuel filter is the one you can’t cheap out on.

Most ‘three-filter Duramax kits’ online swap the air filter for a transmission filter. Here’s what the 2006-2010 LBZ/LMM actually needs — and what it costs.

Your 10R140 10-speed transmission is the most fluid-sensitive part of a 2023-2026 Super Duty. The FT202 filter and MERCON ULV fluid are not interchangeable with older parts — and a $33 knockoff can cost you an $8,000 transmission.

Your 2014-2019 Ram 1500 EcoDiesel takes a 68235275AB fuel/water separator and a 68229402AA oil filter. Here’s the exact fit, the real prices, and the mistake that wrecks these engines.

Your 2017-2025 6.7L Powerstroke runs a dual-stage FD4625 fuel filter plus an FL2051S oil filter. Here’s the exact fit, the real prices, and the mistakes that wreck these trucks.

Your 2025-2026 Ram 6.7L Cummins runs two fuel filter cartridges — a primary water separator and a secondary NanoNet element, both in the engine bay. Here’s the exact fit, the real prices, and the mistakes that wreck these trucks.

Your 2017-2019 L5P Duramax takes two specific filters: the TP1015 cartridge fuel filter and the PF2232 spin-on oil filter. Buy the wrong one and the bypass valve is wrong. Here’s the exact kit, the real prices, and the five mistakes that wreck these trucks.