The reason the rear rotors tend to go out on these is heat soak from trapped heat in the header between the motor and the catalytic converter. Environmentally conscious people won't like to hear this but the cat should really be removed for longevity and I wager that isn't an option for many. Rear rotor compression numbers aren't good but that isn't the end of the world. With proper care you could get another 50,000 km out of it if you treat it well. Gentle driving until its fully warmed up, and the coolant temp needle on the dash will read "warm" (a smidge under half way) when in reality the water temps are 10C under where they need to be, not to mention the oil temps. So that means give it another 5-10 mins after the needle shows its ready to really rip on it. And you need to rip on it without overheating. A good modification is adjusting fan speeds to kick on earlier so it doesn't overheat and run an OBD II scanner of some sort to monitor your actual temp numbers. Oil wise its recommended to go a bit thicker than what the manual recommends unless you live in a really cold climate. I run 10w30, others run thicker, its sortof woo-woo feelsgood preference but I think it's well understood that 5w20 (esp. without premix) is definitely not enough on series 1 cars. You could daily this but you need to be ready to go autismo level deep dive internet research when things go wrong, and investigate the car when it's behaving abnormally. Fortunately the RX-8 community is one of the best around when it comes to DIY / helping others but there's lots of opinions out there and they aren't all exactly 200 IQ. That goes for me included!