zero compression yes Zero lol !

Price aside, there is no comparison between a true synthetic and non-sysnthetic. The wear protection properties are phenomenonally better: I have lost a a turbo oil line while racing, and the pressure stated fluctuating to zero; I kept hammering it for 2 miles. By then the pressure stayed at ZERO and I backed off to 3/4 for the last 2 miles. Fixed the line and put in more oil and kept going. Tore down the engine after that race, and not a scratch on ANTTHING, I swear, and my son is my witness.

And the oxidation rate of the oil when you are racing with synthetics is trivial compared to non-synthetics.

The thinness is just typcial; it is far more stable over temperature, and will maintain that same viscosity to a high temp while non-synthetics will get thinner at high temp than the synthetic is at room temp. So don't let that fool you; at high temp, the synthetic's viscosity holds better.

Gong back to additives, again, I can't wee why to not add them to a synthetic, if it is something like Rislone. Did you know that Mobil1 is actually a highly refined petroleum oil?