I bought a 2015 w/ 85k in 2020. I have no service records from sale. It now has 110k.
I want to keep this vehicle long term. What service should I start with? It drives great with no apparent issues.

 

The maintenance on the RDX is based on the maintenance minder schedule. It's a combination of mileage and driving conditions (city/highway). Service codes will pop up about every 7500-11k miles based on your driving. Here's a pdf showing the codes and the mainatenance: https://di-uploads-pod4.s3.amazonaws...3-2015-RDX.pdf

In the meantime, the timing belt is scheduled to be changed 7 years or 105k miles. They will recommend changing the coolant and water pump (up to you) at the same time. I would also do transmission fluid and differential fluid change. They are pretty easy to do yourself if you want.

That's all I would do. Enjoy!