I use them but one has to balance the hype and advertising with some common sense. Today's technology is a lot different than years ago. The auto industry never bothered to use MPG as a selling point. Today that's a very different story. If they can boost MPG and performance just by installing a really good free flowing air cleaner I believe they'd do it. Case in point. I have advocated Mobil 1 oil for 40 years. Back n the 70's I read nothing that caused me be skeptical of the claim of Mobil 1 and that's still true today. You might say then why won't the Auto Industry use it exclusively??? Good question. It's probably political, like oil in the pocket of the politicians. Now we get to the Corvette. Sometime back in the mid to late 80's Corvette came out with Mobil 1 from the factory. WHY?? From a really, really good source at Valvoline I found out that they took the oil cooler off the Corvette to save weight and the oil temps went to high so they switched to Mobil 1 and the temps came back down. Today the Vette, s far as I know and that may not be up to date, still come from the factory with Mobil 1.