I had a 1985 RX-7GSL-SE with the 13B and 5 speed. It went until 120K miles, trouble free, except for oil changes and plugs. Then it was stolen, so who knows how many more miles it had left in it. It was still on the original clutch and syncro rings. For rotary engines the only things you must watch are the Oil Level (check it weekly, you have trouble if you add more than 1 Qt every 1500 miles or less) and Never, Ever let a rotary overheat. It will warp the aluminum housings for sure. Change the coolant, T-Stat, cap, flush cooling system every 2 - 3 years.