Not surprised one bit. If any of these additives were really that much better than oil, the oil manufacturers would already have it in their oil. Any name-brand oil these days is as good as it gets. So, Pennzoil, Mobil1, Castrol, Amsoil, Valvoline, they're all good. And any brand-new oil (whoever makes it) is better than the used oil in your car. So, the moral of this story, --- change your oil and filter regularly and don't fall for snake oil hype. //END_SOAPBOX
