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Reische 170° Performance Thermostat Application Guide
Thermostats may be cross referenced by engine type or Motorcraft model number.

ENGINE TYPE CROSS REFERENCE

Ford Duratec & EcoBoost engines (including Lincoln, Mercury and Mazda)
1995-2001 2.5L DOHC (24V) FORD-4D
2015-2026 2.7L EcoBoost FORD-50
1996-2012 3.0L DOHC (24V) FORD-4D
2017-2026 3.0L EcoBoost FORD-50
2018-2026 3.3L DOHC FORD-50
2007-2019 3.5L DOHC/EcoBoost (transverse* eng.) FORD-4D
2011-2026 3.5L DOHC/EcoBoost (RWD/4WD only) FORD-50
2009-2020 3.7L DOHC (transverse* eng.) FORD-4D * transverse mounted engine typically
2011-2017 3.7L DOHC (Mustang/F150 only) FORD-50 refers to front wheel drive or AWD vehicles
Ford/Lincoln/Mercury V8
1993-2005 4.6L DOHC (32V) FORD-4D
2005-2006 4.6L SOHC-3V (Mustang GT only) FORD-4D
2011-2026 5.0L DOHC FORD-50
2015-2020 5.2L DOHC (Shelby GT350 only) FORD-50

Reische thermostats are not necessarily compatible with the above engines in every vehicle however, if your Ford vehicle’s Motorcraft thermostat (RT #) cross-references to any of the numbers below, then the corresponding Reische unit is guaranteed to fit your application. (Motorcraft notes and temp ratings are for informational purposes only)

MOTORCRAFT THERMOSTAT CROSS REFERENCE
Motorcraft

RT1208

RT1213

RT1217

RT1225

RT1226

RT1227

RT1238

RT1244

RT1248

RT1250

RT1251

RT1252

RT1255

RT1257

RT1258

RT1262

Notes

Superseded by RT-1225

RWD 3.0/3.3/3.5/3.7L - 188°

Superseded by RT-1227

EB3.0L, Mustang 5.0/5.2L - 180°

Hybrid 2.0/2.5L - 180°

EB2.7/3.0L, F150 5.0L - 190°

2017-20 F150 EB3.5L - 195°

EB2.0L - 190°

New OEM Hybrid 2.0/2.5L - 180°

New OEM 2021+ F150 EB3.5L - 195°

New OEM EB2.7/3.0L, F150 5.0L - 190°

New OEM 2017-20 F150 EB3.5L - 195°

New OEM RWD 3.0/3.3/3.5/3.7L - 188°

New OEM EB2.0L - 190° (includes RG640 gasket)

New OEM EB3.0L, Mustang 5.0/5.2L - 180°

New OEM EB2.3L - 198°
Reische 170°

FORD-50
Motorcraft

RT1085

RT1104

RT1110

RT1131

RT1168

RT1172

RT1175

RT1228

RT1253**

RT1260**

RT1261**

RT1263**
Notes

Early 188°

Early 180°

V8 - 190°

V6 - 190°

2003-04 Cobra - 180°

Superseded by RT-1228

Updated V6 - 190°

Updated V6 - 180°

New OEM V6 - 180°

New OEM Nautilus 2.0L - 198°

New OEM V6 - 180° (includes RG571 O-ring)

New OEM 2024+ Mustang 2.3L - 198°
Reische 170°

FORD-4D

**These Motorcraft models may require modifications to fit older thermostat housings.

If you have any questions about compatibility with your vehicle please feel free to Contact Us.
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