There has never been a better time to buy a GM certified pre-owned vehicle. Starting Saturday, two years of standard maintenance including oil changes will be part of purchasing a Certified Pre-Owned Chevrolet, Buick or GMC vehicle as General Motors moves to tie pre-owned cars, trucks and crossovers to its brands.



GM Owner Care, a first in the certified pre-owned vehicle industry that includes a two-year/30,000-mile standard vehicle maintenance program, will cover oil…