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AV-SCANNER / Service function guides / Engine and oil
This guide explains how an oil life monitor (OLM) estimates remaining oil life from engine run time, coolant temperature, load and driving patterns, and it shows you how to read, reset and verify the system on the vehicles you service. It is written for working mechanics and experienced DIY owners who already handle routine maintenance and want to know when the monitor's recommendation can be trusted and when it should be overridden. After finishing, you will be able to diagnose a monitor that resets incorrectly, choose the right oil and interval for the driving conditions you see, and document the service so the next technician understands what was done.
Guidance is general and covers many makes. Exact procedures and values vary by model, so confirm them in the factory service information for your vehicle.
Download all 12 sections as a branded PDF to use in the workshop.
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