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The 2011-2016 LML Duramax uses the same GM 12639701 glow plug design carried over from the LBZ/LMM generations, so the part is easy to source — the real choice is which manufacturer’s version to run. Here are the real options that fit the LML specifically.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | ACDelco 9G/61G (GM 12639701) Glow Plug | $15-$25 each | Amazon · eBay |
| 2 | Bosch 0250203011 Glow Plug | $15-$25 each | Amazon |
| 3 | Standard Motor Products GP116 Diesel Glow Plug | $8-$15 each | Amazon · eBay |
| 4 | NGK Premium Series D33AS Glow Plug | $60-$90 per set of 8 | Amazon |
| 5 | DieselRx DRX00057 Glow Plug | $10-$18 each | Amazon · eBay |
The picks, in detail
ACDelco 9G/61G (GM 12639701) Glow Plug
The genuine GM OEM part for LML Duramax, factory-fit and the baseline every aftermarket option is measured against.
- GM part #12639701
- Self-regulating heating element
- Direct OEM fitment
- Exact factory spec, no guesswork on fitment
- Costs more than aftermarket equivalents for the same design
Bosch 0250203011 Glow Plug
Bosch’s direct cross-reference to the GM 12639701, from the company that originally engineered the Duramax’s glow plug system.
- Cross-references to GM 12639701
- OE-grade construction
- Bosch is the original design source for this glow plug family
- Priced close to OEM ACDelco, so savings vs. genuine GM are modest
Standard Motor Products GP116 Diesel Glow Plug
A direct aftermarket replacement for the 12639701, sold individually and typically cheaper than OEM.
- Direct fitment for LBZ/LMM/LML/LGH Duramax
- Sold individually
- Lower cost per plug than ACDelco or Bosch
- Less brand recognition among Duramax owners than ACDelco or Bosch
NGK Premium Series D33AS Glow Plug
NGK’s ignition-parts pedigree applied to the Duramax’s glow plug, sold as a full 8-plug set.
- Set of 8 for full engine coverage
- Direct fit for 2006-2011 LBZ/LMM/LML
- NGK’s broader reputation for ignition component quality
- Less commonly discussed in Duramax forums than the ACDelco/Bosch/DieselRx options
DieselRx DRX00057 Glow Plug
A diesel-specialty aftermarket brand made in the USA, marketed as heating faster and holding heat longer than the OEM design.
- Made in the USA
- Direct fit for LB7 through LML Duramax
- Faster heat-up claimed vs. stock
- Diesel-specific brand with a following among Duramax forum regulars
- Smaller brand than ACDelco/Bosch, less long-term reliability data
Buying tips
- The LML shares its glow plug (GM 12639701) with the earlier LBZ and LMM generations — any part cross-referencing that number will fit, regardless of which of the three engines it’s marketed for.
- Replace all 8 glow plugs as a set, even if only one has failed — uneven heating across cylinders is a common cause of repeat failures.
- A glow plug that shears off during removal is a known LML/LMM headache; a quality plug and a torque wrench set to spec reduce that risk more than brand choice does.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.