Cooling Liquid

Handbook (p. 68) points out the fact that aluminium require the coolant liquid to contain a specially designed corrosion inhibitor

This is what I got from the RR Forum : "I highly recommend Mercedes-Benz coolant as it is phosphate-free, silicate-free, and contains buffers that hold the pH neutral for about 3 years. This is very important as high pH (alkaline) coolant and/or coolants that contain phosphates can eat away at aluminum. I also recommend Audi/VW brand coolant as it is identical in composition. It is very important to mix your coolant with distilled water that can be bought inexpensively at Walmart to keep minerals from forming deposits and reacting with the different metals in your cooling system.

And here is another post about extended life collants If you wish to use an extended life or lifetime coolant you can safely do so. Just check with the manufacturer (or on their technical sheets) as to whether the formulation contains 2EHA [sometimes marked as 2EH]. If it does not, and the coolant/antifreeze is stated to be compatible with all makes/models and types of antifreeze you're good to go. I've been running extended life antifreeze in both of my cars for years now with no ill results. It's both more environmentally friendly and less work intensive to be able to change coolant once every five years as opposed to once every two. I'm seriously considering transitioning to Peak Global Lifetime in these cars at next change. Never changing coolant again is a big plus as far as I'm concerned. The only reason we have to do it now is that the corrosion inhibitors have a finite functional life. There are newer ones that don't.

And this also (from RR forum)
There were early issues with early Dex-Cool formulations which contained high levels of 2-EHA, which attacks silicone seals. There were lawsuits related to Dex-Cool and the formulations were changed years ago. I still suggest that people not consider any Dex-Cool formulation for a RR or Bentley.
The above being said, if you do the homework to ensure that the coolant you want to use is 2-EHA (or some drop the "2-" and just say EHA) free it is fine for use in our cars.
I've been using Wal-Mart's extended life in my Shadow II since 2011 with no issues. I have another brand in my Silver Wraith II (and I can't remember which at the moment) that I researched to be sure it was 2-EHA free before using it. It's been in there heading into 3 years now.
I know several people who have been using Peak Global Lifetime coolant for over 5 years now (each) with no issues. I intend to go to a Lifetime formulation the next time I change the coolant, as this is not a job I enjoy and the less used coolant that needs to be disposed of (by recycling, even) the better.
I really do not understand why the urban legend mill will not let the coolant legends die. The manufacturers who make products stated to be "suitable for all makes and models" (and note well, Dex-Cool does not make that claim) know the liability they'd be exposing themselves to, along with the financial disasters that would ensue, were that claim proven to be false. This stuff is tested out the wazoo before release to market, and those on the market now are not new or experimental in any way.
There's nothing better than pure water as far as heat transfer goes, but there are considerations other than heat transfer, like preventing corrosion. There are now "with water" formulations that have better heat transfer qualities than waterless coolants and effectively perpetual corrosion-prevention properties.