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Keep in mind all modern approved oils have a lot of these friction modifiers already included, with no risk. The approved oil versions are all about getting lower friction for higher mileage ratings to hit the CAFE levels.
5W30 from 1999 isn't the same as 5W30 from 2019.
I had a 2013 Acura CL 6MT. My buddy swore by Redline oil as "the magic bullet for butter shifts" and he used it in his Camaro. I put it in my Acura, and it was nothing shy of brutal. Every shift was notchy, the syncro's failed to mesh smoothly. Dumped it out, put in Honda MT oil, and got butter shifts back. The engineers know what's best is most cases. It was a really slick $100 lesson of leaving crap alone.
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