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The 6.0L Powerstroke’s aftermarket thermostat market is small and specialized rather than crowded, so this list stays short instead of padding it with unverified parts. Every option here is a real, currently sold thermostat for the 2003-2007 Ford 6.0L Powerstroke, split between factory-spec replacements and climate-tuned aftermarket options.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Motorcraft/Ford OEM Thermostat (3C3Z-8575-AA) | $45-$55 | Amazon · eBay |
| 2 | Alliant Power AP63496 Thermostat | $40-$60 | Amazon · eBay |
| 3 | Mishimoto Low-Temperature Thermostat & CNC Housing (MMTS-F2D-03FL) | $120-$150 | Amazon · eBay |
| 4 | Mishimoto High-Temperature Thermostat & CNC Housing (MMTS-F2D-03FH) | $120-$150 | Amazon · eBay |
The picks, in detail
Motorcraft/Ford OEM Thermostat (3C3Z-8575-AA)
The factory-correct thermostat for the 2003-2007 6.0L Powerstroke, the safe default if you just want to restore stock cooling behavior.
- Factory Ford/Motorcraft part number
- Stock 192°F activation temperature
- Guaranteed OEM fitment
- No guesswork on fitment or activation temperature
- Keeps the cooling system behaving exactly as designed
- No performance or climate-specific benefit over what’s already failed or worn
- Doesn’t address any cooling issues beyond a simple worn-out thermostat
Alliant Power AP63496 Thermostat
A direct-replacement aftermarket thermostat built to meet or exceed OEM specifications at a lower price than the Ford part.
- Direct OEM-spec replacement
- Meets or exceeds factory performance specs
- Widely stocked at diesel parts retailers
- Cheaper than genuine Motorcraft while matching OEM specs
- Well known and trusted specifically in the diesel aftermarket parts space
- Same stock activation temperature as OEM, no climate-tuning benefit
- Not a solution if you specifically want a low- or high-temp thermostat
Mishimoto Low-Temperature Thermostat & CNC Housing (MMTS-F2D-03FL)
A 185°F thermostat with a CNC-machined aluminum housing, letting coolant flow earlier to help keep temperatures down in hot climates or heavy towing.
- 185°F activation vs. the factory 192°F
- CNC-machined 6061 aluminum housing, won’t rust like cast housings can
- Mishimoto Lifetime Warranty
- Genuinely useful for hot-climate or heavy-towing owners fighting high coolant temps
- CNC housing seals better and resists corrosion longer than a cast housing
- Not the right choice for cold-climate owners who want faster warm-up, not slower
- Pricier than the OEM or Alliant Power stock-temp options
Mishimoto High-Temperature Thermostat & CNC Housing (MMTS-F2D-03FH)
The opposite-climate counterpart to Mishimoto’s low-temp version, with a 200°F activation point that restricts flow longer for a quicker warm-up in cold weather.
- 200°F activation vs. the factory 192°F
- CNC-machined 6061 aluminum housing
- Mishimoto Lifetime Warranty
- Speeds up warm-up time in cold climates versus the stock thermostat
- Same corrosion-resistant CNC housing as the low-temp version
- Wrong choice for hot climates or heavy towing, where the low-temp version is the better fit
- Same premium price as the low-temp Mishimoto option
Buying tips
- This is a narrow, engine-specific part category — the real options come down to matching your climate and use case (OEM/Alliant Power for stock behavior, Mishimoto low-temp for hot climates and towing, Mishimoto high-temp for cold-climate warm-up) rather than choosing from a long shopping list.
- A CNC-machined aluminum housing (both Mishimoto options) resists rust better long-term than a cast housing, which matters on a truck that will see years more service.
- If your truck runs hot under load or tows regularly, the low-temp Mishimoto option addresses that directly; if it’s just a routine thermostat replacement with no cooling complaints, OEM or Alliant Power is the simpler, cheaper call.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.