You can use those 4 oil changes at your discretion but the dealers are told to tell you that GM and the dealer recommends that you change it based on the oil life monitor system.
From the guidelines a dealer friend gave me:
Quote:
21. If a customer insists on changing their oil based on low mileage intervals and not in accordance with the OLM, how should dealers proceed?
For consumers that insist on following premature service intervals, we ask that you honor their request. However, they should be notified that their included
scheduled maintenance is limited to four service events within 2 years or 24,000 miles, whichever comes first. In addition, Service Agents should counsel
consumers that wish to follow premature service intervals on the benefits of the Oil Life Monitoring system (OLM) and the quality of semi-synthetic oil that will
prolong oil life and oil change intervals. GM will take customer consideration into account when reviewing premature service intervals, however these should be the
minority of situations. Promoting premature service intervals is considered a violation of the program guidelines. Any violation may result in Service Agent charge
backs.
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