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So, you bought/brought your own oil to the dealer for the oil change?
What does that cost versus them furnishing the oil?
What oil would they have put in?
They would've put in some cheap 10w30 petroleum-based oil. The Sonata manual first recommends that you use 5w20 (not the 10w30 that they put in - you
can use it, but it's not the first recommended oil) and synthetics (like Mobil-1) are better than regular petroleum oils.
I wanted to go with 5w20 because that's what they specifically recommend in the manual, but after having read a few places that 5w20 in regular petroleum-based oils can actually not be the best for your car because it breaks down and is consumed quickly, I decided that a synthetic would be better.
Buying a synthetic is going to get you better protection over a longer time frame, so you don't have to change your oil every 3000 miles. You probably wouldn't
need to change it at 3000 even with regular oils, but using a full synthetic gives you added peace of mind. It just doesn't get consumed nearly as fast. It will help improve your mileage, too, although to what degree remains to be seen (I'll be doing plenty of testing!). All that, and it will help keep your engine going strong after 100,000 miles are past the odometer and your warranty is up.
I'm by no means an oil expert, and I don't think Mobil-1 is the only oil anyone should ever use for their car. From what I've read, Amsoil would be good too, and Red Line is good if you want to go racing. I just thought that for the money, availability, and long-term reputation of good quality of synthetic oil, Mobil-1 would be the best for me.
It cost me $36 (counting tax) for 6 quarts of Mobil-1 at PepBoys, and would've probably cost about $15-20 for getting it changed at the dealership (would've been about $40 if I hadn't brought my own oil). To me, the benefits of extended engine life and performance and better fuel economy over the long run easily outweigh any initial cost difference in the oil. I'm probably looking at putting at least 200k miles on this car, if not more, because I drive 5000 miles a month and can't see myself getting tired of the car. I intend to keep it a long time and baby it as such. :thumbsup: