I drive a 2007 Kia Optima. it spends most of the time at the mechanic workshop than on the road and due to series of engine problems  i'm tired of trying to fix it.
Almost all the mechanics I've met suggested I get a replacement. Kia engine is so expensive here so my mechanic suggested we adapt an engine from another brand. He said used Japanese engines are cheaper and will outlive any new korean engine, that most guys that drives Korean cars goes for engine replacement due to durability and high cost of mentainance. He said the engine mount can be constructed to fit the new one while a new brain box will also be required for the new engine.

Pleas I need your advice on this. Is it possible to adapt an engine from another brand of car? If yes, what other brand of car engine apart from Korean engine will you suggest.

still waiting for ur contribution and advice.