my 2011 Kia Optima is losing oil,none on engine ,ground no smoke

It’s burning it. See if your vehicle qualifies for the KIA recall by checking with the dealership.

Answer not posting

I'll try this again. It's burning it, check KIA for recalls. The reason your not seeing smoke is a catalyst is handling it for now but it won't last long.

The car's about fourteen years old, and KIAs seem to age more quickly than many others. Yes, oil could be pouring out the exhaust and getting caught in the catalytic converter for now, but I've not seen a complete lack of exhaust smoke in this condition. I suggest you look at the radiator and see if oil is leaking into coolant through a damaged head gasket of head. This isn't uncommon in Korean cars of that age.