The pilot in command is responsible for the safety and status of the plane,
regardless of the owner. If you crash and die and the NTSB determines that
you did improper maintenance, your insurance would likely be voided for
flying an unairworthy plane. Your life insurance carrier may not decide to
pay if your death was the result of an "illegal" activity.

Rental planes generally require 100 hour inspections, but the PIC is still
responsible for the airworthiness.