When pushing the turbo is going to heat up higher than someone in Canada...and the cooldown period is going to be longer- more time for the oil to bake. In the summer it can take 4-5hours before the cat is cool enough to touch to the hand. In the winter its half that.
Higher? Tell us what are your values?
I see turbo vehicles here in CO on track all the time running regular oils. You want to see challenges to cooling? Come here at 5,000ft at 100 degrees. Phoenix is peanuts for this.
Your cooling system maintains your oil temperature. And what is your oil temperature? 220?230?240?250?260? Bcs. those are all ok temperatures for oil.
Also, you want xW40 oils, ok
Two things:
What that has to do with cooling down? Do you think XW40 will cook less? Why? Mobil1 0W40 FS has same HTHS as Motul X-Clean + 5W30, 3.6cP.
XW40 will generate more resistance =more heat. If you truly have oil temperature issues (and you don’t, but let’s say you do), first step is diluting coolant to lower coolant concentration. Run 20-30% coolant concentration instead of 50/50. That allows better heat exchange with environment.
Install oil cooler.
By the way, I drove my Tiguan on I8 West of Phoenix 120mph at 127 degrees ambient temperature. Nothing happened! Not even coolant gauge moved. But, every time I am climing Pikes Peak at 40 degrees I manage to move coolant gauge pass half. And car still runs like a champion.
Not to mention that that I ran on track BMW to 300f oil temperature, which you won’t do on a street ever. Oil I pushed to 300f was Mobil1 0W40FS. And all is good.
Have more faith in oils manufacturer recommends.