BMW Knowledge Base

Technical articles, diagnostic guides and deep dives into problem BMW components.

951 articles in the base · updated regularly

All Cooling System 22 OBD-II Diagnostics 34 Transmission 16 Buying Guide 60 Engine Mechanical 377 Car Overview 327 Maintenance 47 Suspension 1 Electrical System 24

Engine series:

All B47 B48 B57 B58 N20 N47 N52 N57 S55 S58

Engine Mechanical ⚡ Express

The Complete Guide to BMW Engines: Problems, Maintenance, and Pre-Purchase Checks

The complete guide to BMW engines: typical problems of the B47/B57 diesels and B48/B58 gas engines, maintenance advice, and a checklist for buying used. Here's how to extend engine life and avoid a costly repair.

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Engine Mechanical ⚡ Express

BMW N40–N54 Engine Repair and Maintenance: A Complete Guide for Owners

A complete guide to repairing and maintaining BMW N40–N54 engines: model overview, electrical diagnostics, tolerances and dimensions, oil selection, torque specs. Recommended by the Union of Automotive Diagnosticians and ADACT.

Engine Mechanical ⚡ Express

The Complete Guide to BMW N40-N54 Engines: Diagnostics, Maintenance, and Repair

A complete guide to BMW N40-N54 engines: technical specs, diagnostics, maintenance, and repair. Common problems, a used BMW buying checklist, and oil recommendations.

Engine Mechanical ⚡ Express

Excessive Oil Consumption on the BMW N52: Causes and Valve Stem Seal Repair

The causes of excessive oil consumption on the BMW N52, symptoms of worn valve stem seals, and a step-by-step repair without removing the cylinder head—plus tips on parts and prevention.

Engine Mechanical ⚡ Express

BMW N52 Engine: Reliability, Problems, and a Complete Owner’s Guide

A complete guide to the BMW N52 engine: specs, common problems (PCV, valve cover gasket, Valvetronic), maintenance, and a buying checklist. Find out why the N52 is more reliable than the N53 and the four-cylinder engines.

Engine Mechanical ⚡ Express

N43 Engine Repair: Step-by-Step Guide to Timing Chain and VANOS Replacement

A step-by-step guide to BMW N43 engine repair: timing chain and VANOS replacement. Covers the required tools, preparation, removal, and valve timing setup.

Engine Mechanical ⚡ Express

The Complete Guide to BMW M52TU, M54, and M50TU Engines: Problems, Maintenance, and Longevity Secrets

The complete guide to the BMW M52TU, M54, and M50TU engines: common problems, diagnostics, maintenance, and the secrets to a long engine life. Learn how to avoid VANOS faults, test the sensors, and extend the engine's service life.

Engine Mechanical ⚡ Express

BMW S55 Engine: Reliability, Common Problems, and Complete Maintenance Guide

The BMW S55 is a twin-turbo inline-six for the BMW M2, M3, and M4. Here's what to know about its reliability, common problems (oil leaks, the crank hub), and a complete maintenance guide—practical advice for owners and buyers.

Engine Mechanical ⚡ Express

BMW N57 Engine: Lifespan, Problems, and Longevity Secrets

The BMW N57 diesel engine: service life, common problems (timing chain, oil pressure, turbos, EGR), the maintenance schedule, and a pre-purchase inspection checklist—plus tips for extending the engine's life.

Engine Mechanical ⚡ Express

BMW N55 Engine: The Complete Guide to Problems, Maintenance, and Buying

A complete guide to the BMW N55 engine: common problems (oil leaks, water pump failure, rod bearing wear), diagnosis, maintenance, and a pre-purchase checklist. Plus tips on saving money on repairs.