Congrats on the car!!! I downloaded the pdf of the manual and read the whole thing on my flight to Asia after I bought my car a few months ago. Don't rev it high when the engine is cold, but when warmed up the car almost needs to rev high. My car burns more oil when my wife drives it (super gentle) compared to when I drive it (lots of high revs). Not sure why, but there is a noticeable difference. I wonder if anyone else noticed this. In fact, with my driving it barely burns oil at all.
I do oil changes twice as often for a piece of mind, but I don't think it's bad to just do what the car tells you to.
<rant>OIL RANT
Also, while some like to use non-relevant data such as engine temp to state that some other oil is better, for my own car I would only use Castrol TWS. I am not saying other oil isn't better, I am just saying risk is not worth the reward to me.
When my engine died on my M3, BMW covered it OUT OF WARRANTY, but I had to show proof that I only used Castrol TWS 10w-60. That should be reason enough to stick with Castrol. Also, BMW spends a lot of time and money making sure Castrol works well in your car. Research has been done for you. Redline probably works really well with no side effects, but Castrol works for sure. These are special high performance engines with very high stresses and speeds, so I would not only go by weight. In a way I am glad BMW recommends only one oil, rarely do you have a luxury that both exact oil and engine have been tested to perform well together (usually you have to go by oil ratings and weights). It takes the guesswork out.
I agree that it's mostly marketing that they chose to only recommend Castrol, but still there is no reason other than cost to switch to an alternative (you don't get more hp or a meaner sound from Redline or Liqui Moly race oils). And Castrol continues to improve their TWS oil (it's not the same as 7 years ago). Sure there is a balance and a compromise there with TWS oil (it performs well at any outside temp). I just don't see what you gain or improve by using an alternative. Sure, you save 10-20 bucks on an oil change for a $100k car. But 10-20 bucks doesn't even cover half of a tank of gas you burn in no time with this engine.
I am sorry but I don't get it, and I am tired of all these threads popping up saying that Liqui Moly or Redline is better than Castrol, with no real data to back it up. Are people also using 87 gas because it's cheaper and has higher energy density? At least post up a good study with Blackstone labs or something. Cooler engine oil temps doesn't mean anything about how it protects the moving parts, it just means it's different - which is what makes me nervous.
</rant>Sorry, but mis-information needs to stop. Use whatever you want in your V10, but please don't tell me it's a better idea than Castrol. In fact, those that choose to use different oils should keep us updated on how their cars are performing and any differences they see. It will make the M5 board a richer resource. I just don't like the word 'better' without facts to back it up.
/OIL RANT
but my question is regarding oil changes; how often do you guys do them? And how much does it usually set you back at a dealer? I don't plan on pushing my car much, just a daily commuter and no high revving---atleast not much 
