Heh heh, I have a soft spot for RRs and Bentleys and I've looked into them a bit.
Good case of "buyer beware", especially the PRE- Turbo R Bentleys (that's the "pre-'88" catch, why those are so cheap). They're "badge-engineered" RR Shadows/Spurs and have sorta complicated foibles. Hydraulic systems that can be a pain, odd designs that can complicate maintenance (like on some, you gotta remove the wiper motor, etc. just to check the tranny fluid!), and other quirks. And they drive like what they are, obsolete luxo-barges. You gotta really WANT one, and really APPRECIATE the build quality or you'd be making a big mistake.
Heh heh, I DO want one, and I DO appreicate the quality, I have a good mechanic, and I could afford the upkeep, BUT, I STILL resist the temptation. Thank goodness for Auid A8/S8s, if not for them, I'd probably have a Bentley or two.
The Turbo R was such a big deal when it came out because it was the first really good-driving Bentley in ages. The late '60s Bentley T1s through the mid '80s Mulsannes are cheap for a good reason
Turbo-Rs are different from the earlier models, really good, cool cars, but NOT low-maintenance or inexpensive to keep healthy.
If you take good care of them, these RR/Bentley cars (even the early ones I've just criticized) really CAN last forever. But you gotta have a GOOD mechanic with marque-specific knowledge and experience. NOT really something you can learn-by-doing, even if you're good at that kind of stuff.