Sounds incredibly risky. I doubt an oil cooler would do much of anything to lower your coolant temperature.

I would consider:

1. a lower temp thermostat.
2. confirm that your radiator isn't blocked.
3. confirm your fans are operating properly.
4. possibly replace the temperature sending unit.

 

 

Oil is terrible for heat transfer. Cooling it would do very little to cool the engine overall. Lots of effort for little or no gains towards the stated goal.

The coolant mix + pressure means you're not going to boil until about 250. Considering that you're doubling the power demand and the heat load, it's not surprising at all, and I would tend to agree with the crowd.

Again, make sure everything is working properly. I would assume the radiator fans are electric to decrease the parasitic load on the ICE as they've been demonstrated to be more efficient overall. Ensure they are functioning as intended. You might also look at devising a way to manually engage the cooling fans.

 

I'm not remembering if the denali package started in 2011 or 2012, but i know there was a huge difference when i pulled the grille off my 2012 denali hybrid & towed my (5800#) camper compared to towing with it on. Temps rarely dropped below 220 on an 80f day with the grille on & held rock steady at 210 with a/c running when i took it off. The denali grill is apparently horrid for getting air to the radiator. Might be worth an experiment, it's easy enough to pop them off. It's not pretty but it'll tell you if it's an issue with airflow or not.