I've been going back and forth with my dealership and they claim 'nothing is wrong with my car'. It sounds otherwise. It's making a knocking sound while idle and faster during acceleration.

I've tried oil changes, additives, heavier oil, the sound remains:

YouTube - Clicking/Rocking Sound from Santa Fe
YouTube - Clicking Sound Santa Fe 2

Piston slap? Belt related accessory issue? Just got my car back from the dealership and the technician says 'everything checks out'.

Heard a lot about Hyundai refuses to repair 'piston slap' in any of their cars, that true?

 

What kind of oil filter are you using? OEM or aftermarket?