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I ALWAYS do my own oil changes, even when it is free from the dealership. I don't care how "good" of a dealership it is, they have clowns working there that will skip the filter, skip the oil, or just skip the entire process, and say they did it. Or, even worse, they do sloppy work, leave a mess, leave a leaky filter... the list is endless.
Most dealerships have AT BEST 2 qualified mechanics.... and everyone else are just high school dropouts trained to do very basic tasks, which very rarely ever get checked by the 2 qualified mechanics they have on staff. In short, if they "can" short-change you or cheat you, they will.
I've had 2 mechanics fired on the spot, and will do it again when I catch them screwing over customers. I don't trust them as far as I can throw them.
Regarding interval - BMW recommends 10k miles, but after the 1500 mile break-in, I will do it anyway. Then, I will wait the 10k miles, but that is assuming:
1. It was normal driving conditions (no trips to the track or off-road adventures)
2. I use Royal Purple.
Many years ago, I built a mid 2000s STI that I frequently raced at Miller Motorsports Park in Tooele, Utah. 20-minute GRUELING lap battles, around a 2-3 mile track.... full-force.... 160+ mph..... for 20 minutes straight... several times in 1 day.
Mobil1 smelled like a tire that had been set on fire.
Royal Purple?? Not only did it still look "purple", it still smelled like it was brand new.
I've sworn by it since that day, and have used it for every oil change I've ever done, on every car, and I will continue to. I don't care what it costs. After I personally witnessed the difference.... it's worth the $$$.
Just my opinion.
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