The complete list of jobs to do on a high-mileage E46 M3. This is the checklist every owner approaching 100k miles should work through — sorted by urgency and cost.
— Marcus Weber
Preventive replacement of S54 connecting rod bearings before failure. A well-known weakness of the S54 at high mileage. Covers oil pan removal, plastigauge measurement, bearing selection, and rod bolt torque. Critical preventive maintenance.
Replace water pump, thermostat, radiator, expansion tank, and all coolant hoses in one job. Plastic components are prone to failure on aged E46s. Comprehensive guide to the full cooling system refresh.
Inspect the chassis mounting points where the rear subframe bolts to the unibody. A known structural weakness on the E46, especially on higher-mileage or track-driven cars. Covers crack identification, measurement, and when reinforcement is required.
Measure and adjust intake and exhaust valve clearances on the S54 to BMW specification. Out-of-spec valves cause ticking, rough idle, and power loss. Covers shim removal, measurement with feeler gauges, and shim selection.
Flush and replace brake fluid on the E46 M3. Covers correct fluid specification (DOT 4), bleeding sequence, one-person bleeding techniques, and track-day fluid recommendations. Annual maintenance.