I think you have it right there. The 812 Superfast was not designed to get groceries. That is a very low oil temperature. Might as well run some 8 cSt oil.
Probably more like 30 to 50 HP if you accelerate normally. Oil heats up from RPM and the shearing friction between part more than the amount of HP being produced. You could put the car in neutral and hold the RPM at 6000 RPM for 20 minutes and the oil would heat up pretty good, but the amount of HP to spin the engine at 6000 RPM in neutral won't be much at all. Or drive around town in first gear all the time so the RPM is way up there ... that will heat up the oil much more too.My current 812 Superfast has sump temperatures of 165 - 175 F as I drive around town. What am I using at most - 100 HP? 200 HP? Certainly a 20 grade oil around town is way more viscous than a 40 grade oil while racing at the Sebring track using all 800 HP for 30 minutes.
That's pretty cool, in the summer it takes me all of twenty minutes of driving to reach oil temps hot enough to melt plastic, of course my small 4 banger's power band is between 4.5k-6.3k RPM, and it doesn't hold much oil to begin with. Some engines are designed to run as hot as material engineering allows. If it really does run that cool most of the time there's no need for a 40 grade.
Hmm so maybe a thicker oil protects the engine better under harsh conditions but not so under normal driving conditions.“If Ferrari specifies 5W-40 oil, why are you so interested in trying something like 0W-20? Do you believe the thinner viscosity will improve performance?”
Ferrari recommends oil based on the car being on a race track. A 20 grade oil running around town is thicker than a 40 grade oil running at wide open throttle on the track using all 800 HP. As oil takes around 20 minutes to warm up to the operating temperature while driving around town it is almost always thick as honey. Most trips are for me less than 30 minutes long. Hence the oil is even thicker yet.