I've taken my car only to my selling dealer (Orlando Hyundai) and once for a TSB at (Chapman Hyundai, Phoenix). I've had great service from both.
The Service Writer (Salim) (Allen also good) that I use at Orlando Hyundai knows what he is talking about. When I was there a couple days ago because I "thought" a rear seat belt latch was not working, he showed me that I was trying to connect the left belt to the center latch, and it won't work that way. Salim then saw that I had some dirt or scum on the door paint and he went to the trouble of going to the doll up area, got some cleaner and rags, and went to the trouble of cleaning the door. I've never had a Service Writer take time for me like that. (Most are just looking for a commission). Orlando's Genesis Technician, (Mark) does a great job with my oil changes, and answering any questions I have. He showed me how to check the Cabin Filter, as I could not access it, plus when he is finished, he takes car to their Nitrogen filling area, and check and fills tires with nitrogen. Nitrogen fills are free at Orlando Hyundai. Orlando's Parts Guy (Richard) is the best. I purchased an oil filter to carry with me, only for the day I get crazy and get the oil changed elsewhere. Not only did he give me the correct filter, he showed me the difference between this cartridge filter and the cartridge filter for other Hyundai's. Also takes the time to look up correct part numbers, and needless to say, I have purchased a few items from Richard.
I also use Mobil-1 and they have no problem using my Mobil-1 and charging me a little less. (I have no problem paying for their parts [filter] and labor and it is a "win, win" situation).
As for AMX, many places will not take AMX. I have friends with business that will not touch AMX because AMX charges the merchant twice as much as Visa or MC.
When I went to Chapman Hyundai in Phoenix, it took them all of 10 minutes for the TSB, then they asked if I wanted it washed. I said yes, and they did a great job washing it, at no charge to me. I was impressed. If anyone worries about a $350. tint job, then the tint job is not a good tint job. (You were also overcharged by at least $150-$200, as around here, most shops charged between $125 and 175.) I've never had a problem with scratches when having my car washed by either a dealer, or my local car wash.
As for a different class of people at Hyundai dealerships, vice Toyota or Honda Dealerships. Yes, its true. Customers at Hyundai Dealerships are smarter than those at Toyota or Honda (more value for the dollar). As for those that work at these dealerships. so far, I've not been lied to at the only two Hyundai Dealerships I've been to for service, however when I had my Honda Accord, which had a lot of problems, they always wanted to over charge me for accessories, and when I would bring it in for one of many problems, (Under warranty) they would always "Imply" that "This is a Honda, and Hondas don't have problems", or "I'm sorry but we can't duplicate the problem". As for the Toyota Camry I had, it was trouble free, however when I took it in to replace worn out items, (1) Service Department would insist that the Camry was a different model year than it really was, because they went by the build date on the door plaque. This Camry was a built in Japan, which was built earlier than those built in the USA. Then they want to sell me the wrong part, one for the earlier year. (2) Then they wanted to charge me "Beaucoup Bucks" for the part. (I told them "Thanks, but no thanks" and went elsewhere).
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To be honest, I am afraid of even taking my car into be serviced by a Hyundai dealer. I am doing my own oil changes (using Mobil 1) and so far no warranty repairs needed. I noticed a few weird things about the Hyundai service and parts departments I have visited at two different dealerships:
1. The first dealership I went to purchase oil filters (much closer than the dealer where I bought my car) tried to give me a traditional metal oil filter. I insisted that it was a cartridge and after about 10 minutes of searching he came up with a cartridge (which I found out later was the wrong one when trying to install it during an oil change).
2. I talked to the service adviser where I bought the car about a few questions I had, and was not impressed with the guy.
3. My dealer does not accept American Express Cards in their service/parts dept (I guess most Hyundai owners don't have one). Never saw a Toyota dealer service/parts dept that did not accept AMX.
4. If I did take my car in for service, I am afraid they would wash it for me, but would probably use an ammonia based window cleaner on my $350 tint job, which will damage the film.
I just get the impression of dealing with a different class of people at Hyundai dealerships than even I would find at a Toyota or Honda dealer.