Thanks for your response!
I am still awaiting to test drive and look over the vehicle before I decide to buy. What was hard to find is the amount of R-Designs made for 2013 sales. I did see that 23,210 Volvo S60s were sold for 2013 year, but I honestly don't know how many of those had the R-Design trim. It has been hard to find many used R-Design S60s for sale from that year so I am hoping that is a good sign in that there are not a lot of issues being had with them, or as a sign that the owners typically are hanging on to them as a good thing. I've noticed more 2015-newer S60s are available for sale.
Thanks again for your input, I will approach this possible buy with caution and with more research being done.