I agree with you but for the sake of consistent pressure, no 0w20 will hold up on a track. My brother tried on his 86. He set up oil pressure and temp gauges and 0w20 hits 260f real quick. And pressures nose dive fast. He tried a bunch of different group 3, 4, and 5 oils. Including amsoilOil talk is great.
The weight of a lubricant isn’t the “et al” for protection. It is the quantity of modifiers that it has chemically engineered into it. Oil is a fluid that is not very well affected by pressure as much as the properties within it that thermally break down.
When oil temps are registering on your gauge(s), that is only sump temperature not the more intense heat that is flowing nearer the exhaust points or through the turbo.
For Example:
An Amsoil Signature Series 0W-20 outperforms any other grade/weight on the open market regardless of it’s intended use.
Albeit, if an engine calls for a particular grade/weight, just choose the best version of it when you want to play harder.
Frankly amsoil is the worse choice for track duties unless your made of money.
In June I tracked 5 whole days. Drove 300 miles. But did 5 oil changes. One after each session. If I were to use amsoil it would be way too expensive