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Is Acura's SH-AWD system reliable over the long term?
The second-generation SH-AWD (2014 onward on MDX and RDX) is robust and well-documented. The rear hydraulic pump can emit a low drone after 120,000 km if the transfer fluid has not been changed on Acura's 50,000 km interval. A fluid service costs roughly $150 at a competent Honda/Acura independent and prevents virtually all documented failures. The differentials themselves rarely need replacement when maintenance is followed. On a used purchase, ask for proof of SH-AWD fluid changes and budget $150 immediately if records are missing.