Most car engines will make over 100,000 miles without any mechanical rectification. That is about 2,500 hours of operation, ignoring periods at idle, which adds to making a comparison complicated. Most aero engines will do well to get to 1,600 hours without a top overhaul, and a major overhaul by 2,000 hours. On that basis the car engine is vastly more reliable.
Most people reckon their car longevity by miles (or Km, whichever you prefer). A car making 200,000 miles is doing well. An airplane which sees 1,600 hours in it's powerplant, at 150 nm/hr, has made 240,000 miles.