- Joined
- Dec 7, 2020
- Posts
- 6,891
- Reaction score
- 17,445
- Location
- Minneapolis, MN
- Ram Year
- 2017 2500 Laramie Crew Cab
- Engine
- 6.4L HEMI
Greetings all,
There've been various threads over the years questioning normal operating temperatures for Hemi power train fluids. Now that summer is here on the North American tundra, I recorded a few today.
Ambient Air Temp: 88 degrees F
Truck: 2017 Ram 2500 Crew Cab 4x4
Engine: 6.4L Hemi
EVIC Readings with truck fully warmed up, light payload, county highway driving (60 mph), low wind:
Engine Coolant: 210 F (cycling between 205 F - 220 F thermostat)
Engine Oil (Red Line 5W-30): 220 F
Transmission Oil (Mopar ATF+4): 145 F (with oil cooler thermostat removed)
Engine Oil Pressure Driving: 53 psi
Engine Oil Pressure Idle: 33 psi
These are all nominal, normal fluid conditions for Hemi engines. Don't let Stellantis tell you high transmission oil temperature is "normal" - it is only "normal" for a poorly designed cooling circuit.
There've been various threads over the years questioning normal operating temperatures for Hemi power train fluids. Now that summer is here on the North American tundra, I recorded a few today.
Ambient Air Temp: 88 degrees F
Truck: 2017 Ram 2500 Crew Cab 4x4
Engine: 6.4L Hemi
EVIC Readings with truck fully warmed up, light payload, county highway driving (60 mph), low wind:
Engine Coolant: 210 F (cycling between 205 F - 220 F thermostat)
Engine Oil (Red Line 5W-30): 220 F
Transmission Oil (Mopar ATF+4): 145 F (with oil cooler thermostat removed)
Engine Oil Pressure Driving: 53 psi
Engine Oil Pressure Idle: 33 psi
These are all nominal, normal fluid conditions for Hemi engines. Don't let Stellantis tell you high transmission oil temperature is "normal" - it is only "normal" for a poorly designed cooling circuit.
