Duramax Buyer's Guides
Best Duramax Exhaust Systems: DPF-Back, Cat-Back & Downpipes
How to choose an exhaust for your GM Duramax — DPF-back vs. cat-back vs. turbo-back, 4-inch vs. 5-inch diameter, aluminized vs. 409 vs. 304 stainless, the manifold and up-pipe leaks no kit fixes, and why freer flow drops EGTs on the LB7, LLY, LBZ, LMM, LML, LGH, and L5P.
August 3, 2026
GuideBest Duramax Turbo Upgrades: Stock Replacements to Compounds
How to choose a turbo for your GM Duramax — which turbo came on your engine, how to fix a sticking VGT, and when to step up to a drop-in upgrade or compounds on the LB7, LLY, LBZ, LMM, LML, and L5P.
July 22, 2026
GuideCommon Duramax Problems by Generation (and the Parts That Fix Them)
A straight-talk reference to the known weak points of every 6.6L Duramax — LB7 injectors, LLY overheating, LBZ/LMM sticking turbo vanes, LML CP4 failure, L5P — and the exact parts that fix each one.
July 26, 2026
GuideDuramax CP3 vs. CP4 Fuel Pump Guide: Which Pump You Have & Why It Matters
Which GM 6.6L Duramax has the Bosch CP3 and which has the CP4.2 — why the CP4 fails catastrophically, how a CP3 conversion or disaster-prevention kit protects your LML, and the fuel filtration that keeps either pump alive.
July 29, 2026
GuideDuramax EGR & Cooling Guide: Coolers, Radiators & Fixes
Diagnose and fix Duramax cooling and EGR failures — what fails on the LB7 through L5P, the codes that point to an EGR cooler, how to tell coolant loss from a head gasket, and what to compare when you buy a replacement cooler, radiator, water pump, or thermostat.
July 22, 2026
GuideDuramax Generations & Fitment Guide: LB7 to L5P by Year
A year-by-year reference for every GM Duramax generation — LB7, LLY, LBZ, LMM, LML, LGH, and L5P — mapped to the GMT800, GMT900, K2XX, and T1XX truck platforms, so you order parts that actually fit your Chevy Silverado or GMC Sierra HD.
July 23, 2026
GuideDuramax Glow Plug & Cold-Start Guide: Hard Starts, Codes & the Parts That Fix Them
Why your 6.6L Duramax won't start when it's cold — how the glow plugs and controller work, which plugs each generation (LB7→L5P) uses, and how to tell whether it's the plugs, the GPCM controller, weak batteries, or air in the fuel.
July 30, 2026
GuideDuramax Head Gasket & Head Stud Guide: Why Heads Lift & How to Fix It
Why the GM 6.6L Duramax lifts head gaskets under boost, how to read the symptoms, and how ARP head studs vs. factory torque-to-yield bolts change the fix — by generation, from the LB7 to the L5P.
August 2, 2026
GuideDuramax Injector Buyer's Guide: LB7 to L5P Symptoms, Types & Replacement
How to choose fuel injectors for your GM 6.6L Duramax — reading failure symptoms, understanding stock vs. reman vs. performance injectors, the LB7 vs. common-rail differences, and the return-line 'black death' fix by generation.
July 27, 2026
GuideDuramax Maintenance Schedule & Parts Checklist (6.6L Service Intervals)
A mileage-by-mileage service schedule for the 6.6L Duramax — oil, fuel filters, air filter, glow plugs, coolant, transmission, and the wear parts to keep on the shelf. Intervals and part types for LB7 through L5P.
July 25, 2026
GuideDuramax Tuner & Programmer Buyer's Guide: Tunes, Monitors & Doing It Right
How to choose a tuner or programmer for your GM 6.6L Duramax — what a tune actually changes, EFILive vs. handheld vs. cloud tuners, transmission and towing tunes, gauges and monitoring, and the supporting hardware a tune commands. Legal, off-road, and emissions framing explained.
July 31, 2026
GuideDuramax VIN & Engine Code Decoder: Every 6.6L by Year (LB7–L5P)
Decode your Duramax from the VIN. The 8th-digit engine code for every 6.6L generation — LB7, LLY, LBZ, LMM, LML, LGH, L5P — plus the 10th-digit model-year chart and the RPO sticker, so you order parts for the engine you actually own.
August 5, 2026
GuideLB7 vs L5P Duramax: Which Generation to Buy and How to Build It
A full head-to-head of the LB7, LLY, LBZ, LMM, LML, LGH, and L5P Duramax — power ratings, injection pumps, emissions hardware, transmissions, the weak point of each engine, and the first part every generation actually needs.
July 22, 2026
GuideLBZ vs L5P Duramax: Which Generation Should You Buy or Build?
The LBZ (2006–2007) and L5P (2017+) are the two most-loved Duramax generations for opposite reasons. Compare reliability, tuning, power, emissions, and the first parts each one needs — so you buy and build the right truck.
August 1, 2026