Good, it's about time. They can't compete with the big boys who have all the $$ for rigorous R&D and engine sequence testing. So they end up resorting to claims that are never fully substantiated. Royal Purple is among the worst.
This is why I've always like Mobil 1's approach to marketing. Let the product, OEM specifications, endorsements and racing teams speak. You either meet a specification or you don't. It's that simple. You have to pay to play. Everything else is just marketing.
SWRI do the testing and as expected, RP showed no gains.
Quote:
According to SwRI, “there was no statistically significant difference between the fuel economy, emissions data or engine temperature between the two candidate oils,” NAD said.