Why heavy towing hides in plain sight

The seller was a retired couple who'd towed a 2.8-tonne caravan up the east coast every winter for eight years. The Everest presented beautifully — full Ford dealer history, recent tyres, clean interior. The only clues were the tow-hitch wear and the brake-controller wiring still fitted. Heavy towing accelerates DPF ash loading and torque-converter wear in ways that short suburban trips never do.

What the inspector found

• DPF ash accumulation: 187% — the filter is physically full of ash and can no longer be regenerated. Replacement required.
• Torque-converter lock-up shudder: repeatable at 75–85km/h under light throttle, consistent with the 6R80 TSB for converter clutch wear.
• Transmission fluid: dark brown, burnt odour, 48,000km since last change. Ford spec for severe service is 45,000km.
• Brake-fluid boiling point: 165°C — below the 200°C minimum for a vehicle that tows (heat degrades fluid faster).
• Rear diff oil: metallic particles on the drain-plug magnet — not critical, but consistent with heavy towing loads.

Outcome

The buyer used the report to negotiate $3,600 off the asking price — covering the DPF replacement, transmission service and brake-fluid flush. He purchased at $35,390 and had the DPF cleaned (not replaced) by a specialist in Campbelltown, plus a full trans service and brake-fluid change. The converter shudder is being monitored.

"We were buying it for our own caravan. Priya pointed out the ash percentage and said 'this filter has done its lifetime of towing already'. That one sentence changed the whole negotiation."