**PURCHASE FROM THIS BUSINESS AT YOUR OWN RISK**
It's truly a gamble.
Here's my story:
In August of 2021, I purchased a rebuilt motor from Kar King for my daughter's 2010 Hyundai Santa Fe. Once the motor arrived, I had it installed by a certified mechanic. Upon installation, the motor had a noticeable rattle between 2500-3200 RPMs. Everything on the exterior was looked at. Two mechanics (one who has rebuilt numerous hot rod motors) and an engineer from Japanese Engine Exchange all determined that the noise was coming from inside the motor.
I contacted Jorge at Kar King and he asked that I video and audio record the rattle as well as a reading from hooking up an oil pressure gauge, which I provided. Jorge said I would have to send the engine back so he could have his mechanics take a look at it. He would not say that it was their (Kar King) error, even though the noise was coming from something wrong inside the engine. Also, his policy is that Kar King does not pay shipping, nor labor for the engine under warranty. A six month warranty is better than nothing, but really does little to save the consumer money when you have to uninstall the motor and pay for shipping to have them fix something that shouldn't have been a problem in the first place. He offered to fix it or give a refund. Either way, I had to have an engine and would have to pay to have this one removed, shipped back, then get a new one or have this one "fixed", pay to have it shipped, and pay to have it installed ($1000 at a minimum for the Hyundai Santa Fe).
I elected to have a local mechanic look at the crankshaft, bearings, and possibly the rods. It was determined that Kar King put the original bearings back on after polishing the crankshaft, even though they no longer fit. There was a lot of movement with those bearings. This was recorded on video and sent to Jorge at Kar King. Jorge offered to pay for the new parts ($122, give or take), but obviously would not pay for the labor associated with fixing Kar King's error. The vehicle was finally ready to go in late October 2021.
We followed all the protocols of breaking in the rebuilt motor. The maintenance schedule was followed as well. It seemed to run very smoothly.
Fast forward to July 9, 2022. My daughter was approximately 100 miles into a 115 mile trip when the motor started clanking and making other loud noises. She pulled over immediately. Later when the oil was checked, it was determined that there were bits of metal in the oil. We towed it to a mechanic who confirmed that the engine was done. With approximately 8,000 miles on it, Kar King's rebuilt motor blew.
Simply put, I would not recommend Kar King. Sure there is a 6-month warranty, but, at minimum, you will lose time (if you uninstall the motor yourself) and some shipping expenses to exercise the warranty if the product is low-quality as mine was. Otherwise, it could cost you thousands.