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Filters & Maintenance for the GM Duramax

Oil, fuel, and air filters, glow plugs, oil, and the routine service parts that keep the LB7, LBZ, LMM, LML, and L5P Duramax running mile after mile.

3 parts

Match filters & maintenance to your engine

A Duramax will run past 300,000 miles when it's serviced on schedule, and the maintenance is simple compared to the repairs it prevents. Most of the parts are shared across generations — the ones that aren't are worth knowing.

Generation What it means for this part
Fuel filtration: 2001–2016 vs. 2017+ The 2017+ L5P uses a different fuel filter assembly than the 2001–2016 trucks. Filter kits are split by era, so match yours by engine code rather than by 'Duramax.'
Glow plugs Heat range and part number vary by generation. Replace when cold starts get hard or a glow-plug code sets — and always as a full set of eight.
Oil spec Use a diesel-rated oil meeting GM's dexos spec for your year — dexos2 on most older trucks, dexos D on the L5P and newer.
Air filter Airbox and filter shape follow the truck platform (GMT800, GMT900, K2XX), so confirm the body year as well as the engine.

Before you buy

  • → Follow the oil-life monitor, but as a practical cap don't exceed roughly 7,500 miles or one year on a truck that tows or idles.
  • → Drain water promptly when the water-in-fuel light comes on — water is what kills injectors and high-pressure pumps.
  • → Change the oil filter every single time, and keep a spare fuel filter on the shelf so a service weekend isn't a parts-store trip.

Not sure which engine you have? Decode it from the eighth digit of your VIN with the Duramax VIN & engine code decoder, or map your year and platform in the generations & fitment guide.

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Parts in Filters & Maintenance

Doc's Diesel Oil Filter, Fits 6.6L Duramax Chevrolet/GMC 2500HD 2001-2019 | Independent Testing Rates It At 99 Percent Efficiency Down To 25 Microns

Doc's Diesel Oil Filter, Fits 6.6L Duramax Chevrolet/GMC 2500HD 2001-2019 | Independent Testing Rates It At 99 Percent Efficiency Down To 25 Microns

133 owner reviews

$15.99 In Stock at Amazon

Doc's Diesel Oil Filter, Fits 6.6L Duramax Chevrolet/GMC 2500HD 2001-2019 | Independent Testing Rates It At 99 Percent Efficiency Down To 25 Microns. Keep your Duramax running mile after mile with this routine diesel service part.

  • Keeps your diesel running
  • OE-quality replacement
Buy on Amazon
12639701 Diesel Glow Plugs 9G for Duramax LLY LML LMM Chevy&GMC LBZ LGH 6.6L, 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 Silverado, Savana, Sierra, Express Replaces# 97364968

12639701 Diesel Glow Plugs 9G for Duramax LLY LML LMM Chevy&GMC LBZ LGH 6.6L, 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 Silverado, Savana, Sierra, Express Replaces# 97364968

240 owner reviews

$37.99 In Stock at Amazon

12639701 Diesel Glow Plugs 9G for Duramax LLY LML LMM Chevy&GMC LBZ LGH 6.6L, 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 Silverado, Savana, Sierra, Express Replaces# 97364968. Keep your Duramax running mile after mile with this routine diesel service part.

  • Keeps your diesel running
  • OE-quality replacement
Buy on Amazon

Read before you buy: filters & maintenance guides

Written for this exact system, generation by generation.

Maintenance Schedule & Parts Checklist

Mileage-by-mileage service intervals from the LB7 through the L5P.

Glow Plug & Cold-Start Guide

Plugs, the GPCM controller, weak batteries, or air in the fuel — how to tell which.

CP3 vs. CP4 Fuel Pump Guide

Why fuel filtration is the cheapest insurance either pump can get.

Injector Buyer's Guide

Clean fuel is the single biggest factor in how long a set of injectors lasts.

Parts that go with these

Fuel System Injectors EGR & Cooling

Filters & Maintenance: common questions

How often should I change the fuel filter on a Duramax?
Service it on the factory interval for your year at minimum, and sooner if you run marginal fuel or the water-in-fuel light has come on. Fuel filtration is what protects the high-pressure pump and the injectors — the two most expensive things in the fuel system — so it's the last place to stretch an interval.
Which oil does a 6.6L Duramax take?
A diesel-rated oil meeting GM's dexos specification for your model year — dexos2 on most of the older trucks, dexos D on the L5P and newer. Follow the oil-life monitor, but treat roughly 7,500 miles or one year as a practical ceiling on a truck that tows or idles a lot.
Do I have to replace all eight glow plugs?
Yes, do them as a set. They age at the same rate, they're inexpensive relative to the labor of reaching them, and a mixed set of old and new plugs leaves you with the same hard cold start on a different cylinder. Confirm the correct heat range for your generation before ordering.