Vehicle Depreciation
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It depends on the unit type. A light truck loses ~15% of its value each year. A medium one ~12% annually. A tractor-trailer ~10% annually, given its longer useful life. In the first 3 years depreciation is faster; afterward it stabilizes.

The double declining balance method is applied: Value = Purchase × (1 − rate)^years × km factor × condition adjustment. The mileage factor compares current km against expected useful life. The condition adjusts ±10-20% based on the unit's actual condition.

It's recommended to consider renewal when the unit has depreciated more than 60% of its original value, or exceeds the optimal years of operation (8 years for light units, 12 for medium, 18 for tractor-trailers). Beyond that point, corrective maintenance costs tend to outweigh the benefit of keeping it.

Both factors matter. Age determines depreciation over time; mileage determines actual mechanical wear. A unit with few years but high mileage may be worth less than an older one with rigorous maintenance and moderate mileage.

It is 5% of the original purchase value: the value of materials, spare parts and scrap. No commercial vehicle should be sold below this amount, except in a total loss.