One problem related to engine oil leaking has been reported for the 2003 Chevrolet Trailblazer. The most recently reported issues are listed below.
Vehicle started leaveing spots of oil on the ground over night. Was driving to work on Wednesday and a blueish cloud of smoke was trailing behind me. Arrived at work and let truck cool down after whitch I crawled underneath and with a mirror was able to locate the leaking rear main seal. This is a common problem with gm,s 5. 3 liter engines. Multiple forums are posting many people complaining of the same issue. Gm needs to stand behind there products and repair this issue which again is a wide spread known problem.