When to replace a fleet vehicle: policy, scorecard and decision process

Replace with evidence

Use age and distance as review triggers, not automatic disposal rules.
Compare the next ownership period with the realistic replacement alternative.
Give safety and operational fit explicit veto power over a cheap-looking unit.
Document assumptions, approval and the result after replacement.

1. Define replacement review triggers

Set triggers by vehicle class and duty cycle. Reaching one trigger should place the unit in review; it should not silently mark it for sale. Severe duty, long lead times and specialised equipment may require different thresholds.

Age, mileage or engine hours
Repair cost or downtime above a rolling threshold
Repeated safety-critical defects
Loss of payload, range or route fit
Unavailable parts, support or required compliance capability

2. Compare forward-looking cost

Past spending explains the vehicle’s history but cannot be recovered. Estimate the cost to keep the unit for the next decision period and compare it with the net cost of replacement, including acquisition, financing where relevant, resale value, energy, maintenance and expected downtime.

Keep-versus-replace gap

projected cost to keep − projected net cost to replace

Use the same time horizon, workload, currency and cost scope for both options.

3. Use a transparent replacement score

Weight factors according to the operation and publish the evidence behind each score. A weighted total helps rank candidates, but a critical safety or legal limitation should override the total rather than disappear in an average.

Factor	Evidence
Cost trend	Maintenance, fuel, depreciation and forecast repair
Reliability	Breakdowns, repeated defects and unavailable days
Safety and compliance	Inspection failures, recalls and required capability
Utilisation	Distance, active days and idle capacity
Operational fit	Payload, route, range, driver and customer requirements

4. Build a multi-year replacement plan

Rank candidates, then test the plan against capital limits, vehicle lead times and operational seasonality. Spread replacements where concentration would create budget or capacity risk, while keeping urgent safety decisions outside the normal queue.

Record the target decision quarter and accountable owner.
Estimate resale value with a stated source and date.
Identify the replacement class before requesting quotations.
Keep a contingency for unexpected total losses or major failures.

5. Measure the decision after replacement

Compare actual cost, availability and energy use with the approved case after a stable operating period. Record why assumptions missed: workload, price, maintenance, delivery timing or adoption. That feedback makes the next replacement plan more accurate.

Keep the disposed vehicle’s final odometer, sale value, reason and buyer or channel in its history rather than deleting the record.

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