The Z71 Tahoe was purchased in December 2014.  At this time the engine is believed to be the factory original and never rebuilt.  History of maintenance before purchase is unknown.
2004 CHEVROLET TAHOE Z71 --- OEC PERSONAL VEHICLE

OIL ANALYSIS REPORTS
DECEMBER 2015 - 11,045 miles / 11.5 months on oil and filter (engine gaskets/seals repairs during this period)
Oler Equipment Care - Tulsa, Oklahoma
918-949-1504