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6.0L Power Stroke Thermostat

verified OEM PN3C3Z-8575-AA BrandMotorcraft

All 2003-2007 6.0L. The engine uses TWO thermostats, both 190 F (88 C): Ford 3C3Z-8575-AA (Intl 1839304C92) and 4C4Z-8575-AA (Intl 1837971C91). Thermostat o-ring: Ford 3C3Z-8255-AA. Replace both with the water pump.

Where to buy

SellerSnapshot priceChecked
Kill Devil Diesel $54.0 2026-09-08
Bullet Proof Diesel $63.64 2026-09-08

Neutral price comparison - no affiliate links, no paid placement. Catalog-mirror prices run above street prices; treat them as a ceiling.