does a 2013 acura rdx have a timing belt or a chain

It has a timing belt that should be changed out every 60,000 miles.

The 2013 RDX is engineered to be an exceptionally low-maintenance vehicle. With features like iridium alloy-tipped spark plugs and a self-tensioning serpentine accessory drive belt, the 3.5L V-6 engine requires no scheduled maintenance until 100,000 miles* of use- with the exception of periodic inspections and normal replacement of fluids and filters. The first scheduled service at 100,000 miles includes items such as valve adjustment, timing belt replacement and water-pump inspection.

2016 Acura 3.5 timing belt or chain

thank very much