>>28532086Probably the same seals that leak on every k24 engine including mine. The oil leaks down the back of the engine onto the exhaust piping and burns off, that's why you don't see it on the pavement or in the exhaust.
I've been adding oil to mine for 200k miles, seems reliable enough just need to add oil every 2k miles, or pay $500 to get it resealed.