As being new to the Mclaren family, I did do some homework about DYI maintenance before jumping in. What I found at least with the 570's, most of it is straight forward and can be completed by most anyone with some tools and a general knowledge of auto repairs. Well having owned lots of different cars including several Corvettes, MB, a Lotus Esprit and a VW Phaeton,. I mention the Phaeton as it was the most complicated and time consuming oil change I have ever had to do. The bottom tray had like 18-19 bolts of three difference sizes, but the bonus was getting to the oil filter. You had to completely remove the pass side airfilter assembly and tubing to get access to the filter. Start to finish it was about a 4 hour job which was confirmed by a VW tech when I ask him if there was a short cut or something I was missing. Simple answer - NO its just a PITA. Some cars are a 15 min job while others are not.
The Mclaren oil filters are just repackaged filters used by BMW that are available aftermarket for less than $15. O-rings and washers - buy a assorted pack of each from Amazon for approx $20, Oil is simply Mobil 1 0w40 European for about $30/5 qt jug.
I am fortunate being able to be able to work on cars. I to all of the routine maintenance and repairs for all the family vehicles as much as a time saver as well as more cost effective. It often takes me less time than just the drive to a shop or dealer. Dealers now have fancy waiting rooms for a reason. The Mclaren dealer is 2 1/2 away so again time savings is a big driver not to mention their lofty labor rates.
While not rare or as expensive as a Mclaren, Corvettes are nice fun cars and provide excellent performance/looks for the $$ so dont knock them.