Chrysler 300 Performance Mods - Engine - 6.1L
There's been an ad in Hot Rod for a few months for an oil "booster" called PX3. Their claims were impressive - "up to" 5% horsepower, and an improvement in gas mileage.
Yeah, I know, most of them are BS. However, when I went to their website, they showed dyno test results. One was for an '06...