My mother in law took her Hyndai Elantra in to Majestic Auto in Tucson, Arizona for a timing belt replacement. (The belt was old and due for replacement, not broken yet.) Part of the repair included a water pump replacement as this is much more simple when the timing belt cover is already off and considered good preventive maintenance.
The next week my father in law took it back in because it was not running right. The engine running poorly, revving, overheating. They told him it was fine. The next day the engine was ruined (blown). When she asked what happened, they told her it was due to the "cam not being in time with the valves" and the engine being "worn" and "overheated." They also said there was water in the oil and oil in the water (duh. The motor's blown.) and the oil looked too dark and implied it was not serviced often enough. In order for the "cam" to not be "in time with the valves" the "timing belt" would have to have been installed incorrectly. When they replaced (supposedly) the water pump, the coolant system would have to have been drained and refilled. (There was no water in oil/oil in water then?) The engine was FINE when it went in to the shop. The oil was changed every 3000 consistently (I know because I did it.) It was only taken to Majestic for the timing belt because they were somewhat cheaper than the dealer for the difficult but required timing belt replacement. They offered her a used motor for $2300.00 plus RR. Majestic refused to admit any wrong doing and refused to repair the car or incur any expense of replacing the motor. The car is not worth the cost of repair now.