2000 — 2002
5.8L (M137) - CL 600 V12
Petrol
Test the ABC (Active Body Control) system by toggling the ride height button while stationary. | Note: Listen for any irregular noises from the pump and ensure the car rises and lowers promptly without warning lights on the dash.
Perform a 'cold start' check to observe the engine's idle stability. | Note: It is worth observing if the V12 settles smoothly into a steady rhythm; erratic idling on the M137 engine can sometimes point toward aging ignition components.
Inspect the front lower control arm bushings and ball joints by steering lock-to-lock in a quiet parking lot. | Note: Listen for any clunks or creaks, as the heavy V12 engine places significant strain on the suspension geometry over many years.
Operate every electronic convenience feature, particularly the soft-close door and boot mechanisms. | Note: These complex systems rely on vacuum pumps that can occasionally show their age, so ensure they latch firmly without sounding laboured.
Usually the time to evaluate the health of the ABC struts and hydraulic accumulators.
A common interval to check ignition coil packs and spark plug condition, as the M137 uses dual-spark ignition.
Recommended for a thorough inspection of engine mounts and transmission service to ensure long-term comfort.
Prioritise regular flushing of the Pentosin hydraulic fluid for the ABC system to extend the life of the pump.
Keep a close eye on the cooling system; these V12s run hot, so healthy coolant and hoses are vital.
Ensure the engine oil is changed using high-quality synthetic oil, as the M137 engine thrives on clean lubrication.
Periodically check the electrical battery health, as these cars are quite sensitive to voltage drops.
Check for any signs of weeping from the valve cover gaskets, which is a common observation on vehicles of this vintage.
Estimated repair costs if issues arise
If this component needs attention in the future, it is a specialized job involving the hydraulic suspension system. Depending on the car's history, you might eventually need to budget for strut or pump maintenance to keep the ride feeling like new.
The M137 V12 features a unique ignition system. If the car develops a misfire over time, it is common to consider professional diagnostics, as replacing or refurbishing these ignition units is a significant task.
If you notice erratic gear changes, it is worth consulting a transmission specialist. Future budget planning for the conductor plate or a potential service is a smart way to ensure the 5-speed transmission continues to shift smoothly.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer