If a engine only lasts 5000 miles it wasnt broke in properly, or wasnt rebuildt corectly.

If a rotary blows smoke during start up then stops after warm up, it is Not a problem. That is from running the engine with low oil, then it will harden the oil o rings in the rotors and will allow oil to leak past while sitting. Or from condinsation in your exhaust, which will stop smoking sooner than the oil. If a rotary blows smoke during hard excelleration, TIME FOR A REBUILD! sorry. . .