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It means prolonging the interval of service for an oil change... extending it a bit longer...

Extending the amount of time at which you perform certain services. There are service intervals for things like oil changes, transmission liquid changes, differential liquid changes if your mdel has a diff, replacing spark plugs, etc. Manufactures frequently have a couple of schedules for these services to be performed. for example, one scedule for normal driving, another for "severe" driving conditions.

The Service Interval may be defined by the car maker. In some light responsibility situations, the service interval may be expanded or doubled. as an example, if you used Synthetic Oil in your car, you would not have to have oil changes at 5000 or 10,000 mile intervals. You may also have time change intervals, like once a year if you are not driving so much. Service interval prolongation is a term that tells what time or mileage you have to certain maintenance tasks.