The available options are:
A. Oil maintenance B. Self-assessment C. Seat/mirror adjustments D. Vehicle check
Hence, considering the following options, the option that is not a basic procedure is Oil maintenance.
On the other hand, however, the issue of oil maintenance is more applicable, in the sense that, it needs changing only when the car reaches over 15,000km
Hence, in this case, the correct answer is : Oil maintenance
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