My parents have a 2009 RDX With the turbo I4. The thing was pretty much bulletproof for 270k miles, most of which we’re driving in Boston traffic. When we would visit, my parents would let my wife and I drive it and even near 270k miles it was tight and rattle free.
Around 270k it started to have issues though. The liquid/oil transmission cooler blew and coolant Dumped into the trans. Then shortly after the external trans cooler blew. ever since then there has been a cascading series of failures so I think my parents are giving up on it.
Oh and the SH-AWD was great. It really did work well.