I know someone with an RX8, you have to run the engine 5 minutes before it can move and uses nearly as much oil as petrol. On the other hand it can almost fly and travel through time. Wankel has fewer moving parts than a reciprocating engine, but one of the parts that do move is the oil round the rotor tips and sides. I've not checked if it steers better one way than the other, like a Sopwith Camel.