This is one of those questions wrapped in legend, but there’s truth at its core.

The Rover V8 (found in Discovery 1, Discovery 2, Range Rover P38, etc.) can develop slipped liners when the engine significantly overheats. Overheating distorts the alloy block enough that a liner can lose its seat.

A non-overheated V8 rarely has this issue.

In practical terms: treat the cooling system like holy scripture—radiator, water pump, thermostat, viscous fan. Healthy temperature equals healthy liners.

On models like the Discovery 3/4 (LR3/LR4) and Range Rover models with EAS (Electronic Air Suspension), an overnight drop is almost always caused by tiny leaks at the air springs, valve blocks, or broken height sensor.

The system is designed to self-level, so even a small leak can cause it to “trim” itself lower.

It’s usually not the compressor’s fault.

A soap-bubble test on lines and airbags is the classic diagnosis—and a shockingly effective one.

This one depends on the model.

Older Td5 and Tdi diesels used timing belts that needed regular changes.

Modern Ingenium engines and the LR4’s 5.0/3.0 variants use timing chains, which are meant for the life of the engine but can stretch if oil changes are neglected.

The supercharged AJ133 V8 and the 3.0 V6 are most sensitive to long oil intervals.

In practice: fresh oil = happy timing chains.