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The old time and mileage parameters for oil changes were based on conventional motor oils. Today's full synthetic oils can go further and longer.
That is why most manufacturers use the onboard computer to tell you when it is time to change the oil. It is based on how the engine is being used and how it is running.
Most synthetics can go 7500 mile and well over a year between oil changes.
The only caveat is if you are operating in extremely duty conditions, pulling heavy loads often and / or running in extreme temperatures.
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