You would need to know how many miles truckers drive each year. Once you know the mileage you then divide by 10,000 to yield the number of oil changes in a year's time.
One would have to know how many miles the trucker travels in a year. It appears as if that data is not provided. Once that total mileage per year is known, then divide that value by 10,000 to yield the number of oil changes in a year's time.
