Well, for example:<br /><br />'97 to '03 Ford E Series vans with Triton 4.6 and 5.4L engines (which are probably most of them) are known to have blown spark plug problems, which can cost thousands of dollars to fix (it won't happen to everyone, but many have complained about this problem.)<br /><br />According to MSN Autos:<br /><br />- 2003 Chevrolet Express vans are known to have a problem with catalytic converters failing ($650 fix, happens with 4.8L, 5.3L, and 6.0L ones) and Ignition Lock Cylinder Housing failing ($300 fix)<br />- 2006 Chevrolet Express vans are known to occasionally have a problem with fuel injectors failing ($930 to fix)<br />- 2007 Chevrolet Express vans are known to have a problem with the automatic transmission failing ($1800 to fix)<br /><br />These are not maintenance issues, but issues on the part of the manufacturer.