I would run 91 or 93. That high of rpm’s might be a symptom of the knock sensor protecting you and pulling power. I’m not sure how much of a difference in heat it’ll make, but there’s that.
Temps always drop below 225 after the long sustained climbs. The engine temp will never stay at above 230 for more then 5-10 mins or so until we hit the top then the temps drops down to normal. Trans temp has never gotten hot enough to display a temp. Assuming that its behavior is similar to the engine temp that as it hits some upper limit the temp value gets displayed. I have not used forscan to display the temps.
I'd run 93 and drop it down to 50 mph myself. But it's your engine. 93 helps the motor make better power longer as it doesn't have to pull timing as quickly and should also help with pulling power (every 10-15 HP helps)
yes sirPretty sure Ford states in the owners manual to use "premium" when towing.
I'm not saying it would make much difference when it comes to the heat dumped into the coolant loop from long sustained boost towing up a steep grade.
That's been the Achilles heal for the 3.5 Ecoboost since 2011. Although the engine management and failsafe logic has been improved.
Locking out gears to substitute rpms for boost has been a good strategy used by those with Ecoboost towing experience, but like mentioned above, 5000rpms might be a little higher than I would choose.
Sometimes all you can do is slow down a bit and let it shed some heat from the coolant loop. High 240's is close to hitting limp mode, and then you'll slow down anyway.
owners manual states 91 octane minimum recommended for towing.
