Dashes that crack in only about 20 years or so.
Having to buy stock in Exxon to do oil changes.
Getting to that &@#$ sparkplug in at the front of the engine.
An engine which is assembled from more darn pieces than anyone outside a racing garage would design. And did I mention the potential for oil leaks?
(Of course, when you hit a medium-fast sweeper in 3rd, all is forgiven.)
Les