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---
name: run-preventive-maintenance
description: "Run a PM program against maintenance CPM and downtime so a deferred PM doesn't become a roadside failure. Reach for this when repair costs rise."
---
# Skill: Run preventive maintenance to CPM
PM is cheaper than the breakdown.
## Step 1 — Read maintenance CPM
Maintenance cost ÷ miles, by truck and age (§3 #5).
## Step 2 — Measure unplanned downtime
Separate planned PM from unplanned failures.
## Step 3 — Tighten the PM schedule
Set PM intervals that beat the failure curve.
## Step 4 — Call replacement on lifecycle
Replace when rising maintenance CPM exceeds new-iron cost.
## Output
A maintenance-CPM read, a downtime split, a PM schedule, and a lifecycle replacement call.
