ENZO (name of car) spec and FF 10W-60 as do Porsches and certain M3s, and thats some thick Oil with a nice W number, for start-up flow. Push it hard on that.
You can also put 5W-50 or 15W-50 in a BMW
The difference in 5W-50 to 15W-50 i cant differentiate, Ford GT40 also specs 5W-50.. not 15W-50
Some cars spec 20W-50 if high heat and extended periods, they are surely not American though
Dr Hass with 0W-20 (no longer 5W-20) is NOT the normal person. He doesnt even go a 30 on his. Wow. AND it was NOT FF for his car.
Kind of does to show that KV number is 100% Oil temperature based, eh.
So Dr. Hass never gets his car up to normal tempterature, even once....