I work for a marketing firm and we're doing a campaign for Castrol Syntec. I'm just wondering if anyone has put it in their rx7 before, and what kind of results (if any) they got? We need some testimonials. I'm going to put some in my FC next time i do an oil change. I've used GTX 20w50 religously up till now.

 

me too... Daily driven on it for 2 years with zero problems. I switched to mobile 1 for a month or two and noticed zero difference.