Does anyone else get gold plated oil?

Yes, the M Tax isn't going to help. What's the total cost of the service and is it every 2 years / 20k miles like a normal BMW?

I don't know how much it was for the 750 because it was covered by the complementary service pack for all the time (well, mileage) I had it.

This was just an oil and microfilter service which came in at £440 incl VAT. Oil was £149 and the microfilters were £119. Oil filter £26 and the rest labour.
It needs a brake fluid service next year at about £300 apparently and two years from now it needs a major service which is listed at about £900 before they start looking to replace pads and discs etc etc.

So over 4 years it's, £1,640 which isn't too bad at all for an M car.   Mine is on 12 month / 15k miles intervals and the minor/major services are just over £500/£800.

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I must admit that I only buy base oil 20w50, if I knew of a better oil for air cooled engines I would get it but not seen so far.

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I used to manufacture screenwash in huge quantities, 50000 Litres plus. Standard stuff was literally isopropanol and water. We also made BMW screenwash, which had one other ingredient in that I can't remember, but was sold at a massively increased price. The winter stuff just has a greater percentage of IPA in it to prevent it freezing.

You're not getting anything special beyond a different perfume and colourant. Go to B+M and buy a 5 litre bottle for £2.50.

I use Miller because that's what the local factors has in, or I use Smith and Allen in Darlington. I think Shell make their oil and they are useful for EP90 which my local factors doesn't stock.

Screenwash. It really used to boil my piss when I topped off the screenwash prior to service to have a charge on the bill for screenwash. I use Comma Extreme. A 5 litre bottle will last a year or so and it works down to -30 when used neat. It's probably pure alcohol as Blarno mentioned.