tlwyse

I don't want to start an oil war but just want to know if 5w-20 Royal Purple synth oil is OK to use in these engines and whether it burns OK? Previous owner was using it so I just continued to use it. Engine uses about 1 qt. per 800 miles right now @ 82,000 miles.

TeamRX8

iTrader: (25)

if you mean “needlessly burn the cash out of your wallet”, it’s your choice ...

all I mean by that is synthetic is generally considered acceptable

and ime the people using RP typically have fallen for a candy purple marketing shtick that paying more for it somehow benefits their Renesis engine.

it’s certainly not any better benefit than any other synthetic, and could be argued to not be any better than a good quality dino oil either wrt the Renesis engine.

you would probably be better off bumping it up to at least a 5W30 or 10W30 grade regardless of brand/type
.

Loki

iTrader: (1)

^^ +1
​​​​​​I ran it for a time years ago. It's fine but don't feel obliged to continue using it.

Snox801

Synthetic is fine. BHR actually recommends it.
I run amsoil 5w50 in mine and it seems fine but I ya e low miles and track the car.
That being said I think team hit the nail on the head. If you want to use purple do it but I would at least go 5w30

0-TO-100_Real_Quick

I used the RP 5w-20 for little over 3 years. UOA's looked fine. If you want peace of mind about using it, RP's website specifically addresses use in rotary engines. At the end of the day though, if you're changing the oil at the recommended intervals, I can't say I'd recommend using RP because it is more expensive. There's plenty of RX-8's here with high mileage that used cheaper oils.

10KRPM

I am running RP 10W30, have been since I bought it 18 or so months ago. No argument that it's more expensive as mentioned. I buy it in the jugs which brings the price down a bit.

tlwyse

Thanks all for the advice. Still going to stick with Royal Purple but I'm changing from 5w-20 to 10w-30 since I live in NC and summer will be upon us soon.