very quiet & reliable car up to approx. 6000 EUR (Austria, 10tkm/year)

hi & many thanks in advance for every tip! I have a problem with the neck spine after an accident and am very sensitive to noise of the 2011 Volvo XC60 my girlfriend is at highway speed too loud I ask you for tips for very quiet, comfortable and reliable models up to approx. 6000 EUR (possibly 7000) (2000 EUR for repairs in 30tkm are planned, but not to start immediately 😉 drive about 10tkm autobahn per year bmw 7er e38 from the dealer hardly to find, according to forum high repair costs n bmw 5er e39 (thanks to civictourer 😉 so far only private viewed, which were very consumed despite low mileage Audi A6 C5 I had two (BJ 98 and 02), the V6 diesel is susceptible to injection pump, the petrolers with 163 hp: are difficult to find, many have the Multitronic, which caused me with the 02er problems Mercedes CLK 200 C209 BJ 2003 probbefahrt, quiet is the nich 😉 rolling noise, door seals (Coupe) Mercedes E-Class 211 (2002 – 2009) and Audi A8 type D2/4D good received models so far over budget I am happy about every contribution! nice tag! mike