Try http://racingarticles.com/article_racing-30.html

Also, if you don't want to DIY, you could send you oil off to a lab for analysis (such as http://www.blackstone-labs.com).

96 Contour SE Duratec V6 24-valve 2.5L ATX 108,000 mi. Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil