I recently had my Hyundai Tucson services with the Hyundai authorised dealer recommending an engine flush, even prior to inspecting the vehicle. An ‘engine flush’ clears the gunk out of your engine by pouring a chemical into the engine and idling. Due to the use of chemicals, it can possibly be damaging to modern car’s engines.
I was concerned due to no mentioned of an engine flush in the Hyundai Recommended Maintenance Schedules, so I contact Hyundai directly, this was their response:
I have been in contact with our technical department both locally and overseas and they have advised that Hyundai don’t recommend an [engine] flush at service.