First, a suggestion: read this article, including the section that say "read more", or buy the pdf so you can print it. It makes some good points about understanding customer needs:
Customer input article
Second- my input:
I hate paying someone to do something I can do myself so I used to do all my repairs except tires and alignments.
As I've gotten older and with kids time is more valuable to me than the cost of oils changes so I let the dealer do them.
I've had mixed experiences with dealers, but the current ones are decent. More detail below if you want to read on.
We did take the 2003 forester we used to have to the dealer when under warranty, but after the warranty I did all the work on it including oils changes, brakes, exhaust, oil pan and valve adjustment.
Since buying my Elantra and the wife's Sedona in 2011 and 2010, respectively, everything but brakes and filters have been done at the dealer.
The kia dealer has been good about not upselling, and even stating when a requested tire rotation isn't needed.
I hadn't checked the mileage since the last rotation but they did and supposedly measured tread depth.
I did have them replace an Evap canister, which was pricey, but saved me having to try to locate a crack by the mounting bolt. Still bugs me that it happen 5k miles out of the bumper to bumper warranty, but so far that's been the only non-maintenance repair.
The Hyundai dealer I originally bought from wasn't trustworthy and tried to tell me I needed a timing belt. In addition to pushy Upselling of fuel services and other snake oil.
The dealer I've been going to the last 4 years has been good. There have been some disagreements that took some persuasion to get them to correct, such as missing trim clips and misaligned hood after engine replacement. But since all oil changes had been done at a dealer there were no issues when the transmission and engine were replaced under warranty.
When they did the engine I had them do the spark plugs, thermostat, and belts. It just cost me for the parts, since it was done with the warranty engine.
The current Hyundai dealer provided loaners that were less than a year old any time it was in for more than a few hours. The kia dealer will provide loaners, but they tend to be older.
Both vehicles have tires that were bought from the dealer. They special orders the tires I wanted and the dealer matched tire racks price with shipping and was cheaper than the authorized installers.
Now that the Elantra is out of warranty (104k miles) I'll probably still have the dealer do the oil changes, but I'll do the repairs.
The Kia still has power train warranty left and will continue to go to the dealer for oil changes and any warranty repairs, or repairs that are inconvenient/require special tools.
The exception may be spark plugs at 100k since the research I've done says the plenum need to come off the intake and I don't want to pay the dealer labor rate for that.