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This is a genuinely narrow category, and it’s narrow for a specific, useful reason: the 6.0 Powerstroke’s combustion chamber design changed mid-production, on trucks built on or after September 23, 2003. Ford shortened the glow plug by 1.2mm to match the revised piston bowl — install the longer, older-spec plug in a newer-design engine and you risk glow-plug-to-piston contact, a real and expensive failure mode, not a theoretical one. That means “best glow plug for the 6.0 Powerstroke” isn’t one list, it’s two, sorted by which physical part actually fits your engine. Check your build date (on the door jamb sticker) before ordering anything below.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Motorcraft ZD-32 (4C3Z-12A342-A) | $12-$15 per plug, $90-$100 for a set of 8 | Amazon · eBay |
| 2 | Motorcraft ZD-13 (4C3Z-12A342-AA) | $12-$16 per plug | Amazon |
| 3 | Bosch 0250212007 Glow Plug | $11-$14 per plug | Amazon |
| 4 | Ensun Diesel Glow Plugs (ZD-13 spec, 20mm) | $45-$65 for a set of 8 | Amazon |
| 5 | Ensun Diesel Glow Plug Kit (pre-9/22/2003 spec) | $45-$65 for a set of 8 | Amazon |
| 6 | DNA Motoring ZTL-H-0007 Glow Plug Set | $35-$50 for a set of 8 | Amazon |
The picks, in detail
Motorcraft ZD-32 (4C3Z-12A342-A)
The current OEM part number for engines built on or after September 23, 2003 — the shorter glow plug matched to the revised piston bowl design. This is the correct Motorcraft part for the vast majority of 2004-2007 6.0 Powerstrokes on the road today.
- OEM Ford/Motorcraft part, current production spec
- 1.2mm shorter than the earlier ZD-13 to clear the revised piston bowl
- Fast-heating coil, corrosion-resistant tube
- Direct OEM fitment
- Correct, current OEM spec for the vast majority of these trucks
- Ford-backed part quality and fitment guarantee
- Widely stocked, easy to source
- Wrong length if your truck predates the September 2003 design change — verify build date first
- Premium OEM price versus aftermarket alternatives
- Individual plugs sold separately from harness/GPCM components
Motorcraft ZD-13 (4C3Z-12A342-AA)
The earlier OEM part number, correct only for engines built before the September 23, 2003 piston-bowl redesign. Now largely superseded by the ZD-32 in current production and increasingly hard to find as new-old-stock.
- OEM Ford/Motorcraft part, pre-redesign spec
- Correct length for pre-9/23/2003 production engines only
- Same coil/tube construction as the ZD-32
- Officially superseded by ZD-32
- Correct fit for the small window of early-production 6.0L trucks
- OEM quality matching the newer ZD-32
- Still findable through diesel specialty retailers
- Wrong length for the majority of 6.0 Powerstrokes built after 9/23/2003 — do not guess on this
- Being phased out as new stock, so availability is shrinking
- Easy to order the wrong one if you don’t check your build date first
Bosch 0250212007 Glow Plug
A non-Motorcraft OEM-quality alternative for the 2003-2007 6.0L Powerstroke, from a manufacturer that also supplies OEM glow plugs to several other automakers — a legitimate step down in price from Motorcraft without stepping down to generic aftermarket quality.
- OE-equivalent quality from a major automotive supplier
- Direct fit for 2003-2007 6.0L Powerstroke
- Individually sold
- Standard Bosch glow plug construction
- Reputable major-supplier quality, not an unknown import brand
- Priced below Motorcraft per plug
- Individually available if you only need to replace one or two
- Still requires you to confirm which length/spec your build date needs
- Less commonly stocked at general auto parts stores than at diesel specialists
- No bundled harness/GPCM kit option like some competitors
Ensun Diesel Glow Plugs (ZD-13 spec, 20mm)
An aftermarket 8-piece set explicitly sold matched to the ZD-13 spec and length (20mm), for 2004-2010 trucks — Ensun’s listing calls out the length directly, which is unusually clear fitment labelling for this category.
- 8-piece set, dual-coil fast-start design
- Explicitly labelled to ZD-13 spec, 20mm length
- Compatible with 2004-2010 E350/E450, F250-F550 Super Duty, Excursion
- Dual-coil design for faster cold starts
- Unusually clear length/spec labelling reduces the risk of ordering the wrong fitment
- Full 8-piece set at a lower price than 8 individual OEM plugs
- Dual-coil design aimed at faster cold-weather starts
- Aftermarket coil life is generally less proven long-term than OEM
- Sold as a full set only, not individually
- Still an aftermarket brand without Motorcraft’s fitment track record
Ensun Diesel Glow Plug Kit (pre-9/22/2003 spec)
A separate 8-piece Ensun kit specifically for the early production window — 2003-2004 trucks built up to September 22, 2003 — the aftermarket counterpart to the increasingly scarce Motorcraft ZD-13.
- 8-piece set for pre-9/22/2003 production
- Matches the earlier, longer glow plug length
- Dual-coil fast-start design
- Direct-fit for the early piston-bowl design
- Fills the gap as genuine ZD-13 new-old-stock gets scarce
- Full set pricing beats sourcing 8 individual OEM plugs
- Clearly labelled by production-date cutoff, reducing fitment guesswork
- Only correct for a narrow early-production window — most 6.0L trucks on the road need the other spec
- Aftermarket coils, same durability caveat as the other Ensun set
- Easy to buy the wrong one if you skip checking your build date
DNA Motoring ZTL-H-0007 Glow Plug Set
An OE-style 8-piece set for 2004-2010 trucks, positioned as a straightforward budget alternative to both the Motorcraft and Ensun options, without the dual-coil marketing angle.
- 8-piece set, OE-style construction
- Compatible with 04-10 E350/E450, 04-05 Excursion, 04-07 F250-F550 Super Duty 6.0L
- Standard single-coil design
- Direct bolt-in fitment
- Lowest-priced full 8-piece set in this list
- Clear model-year and vehicle compatibility listing
- Straightforward OE-style replacement with no extra features to pay for
- Basic single-coil design, no fast-start feature like the Ensun sets
- Newer, less-established brand in the diesel parts space
- Still needs the same build-date fitment check as every option here
Buying tips
- Check your door-jamb build date sticker before ordering anything. Built before September 23, 2003 needs the longer, earlier-spec plug (ZD-13 or its aftermarket equivalent); built on or after that date needs the shorter ZD-32 spec.
- Installing the wrong length isn’t a minor mismatch — a too-long glow plug can contact the piston on the redesigned combustion bowl, which is an engine-damage risk, not just a fit issue.
- A full glow plug replacement is also the right time to inspect the glow plug harnesses and the Glow Plug Control Module (GPCM) — a failing GPCM causes symptoms (hard cold starts) that look identical to worn-out plugs.
- If more than 2-3 plugs have failed, replace the full set of 8 rather than spot-replacing — the remaining plugs are the same age and will follow shortly.
- OEM Motorcraft plugs cost roughly 2x the budget aftermarket sets, but the coil failure mode on cheap plugs is exactly the hard-cold-start problem you’re trying to fix — factor that into which end of this list to buy from.
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