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

BMW B58 Oil Pump Problems on 2019–2021 Engines: A Complete Guide to Diagnosis and Replacement

A complete guide to the B58 oil pump failure on 2019–2021 BMW engines: symptoms, diagnosis, replacement, and prevention. Learn to catch it early and avoid a costly engine repair.

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Engine Mechanical ⚡ Express

B58B30C: Weak Points, Tuning, and Engine Longevity — What Owners Need to Know

The BMW B58B30C is a modern inline-six with a closed-deck block. Its weak spot is cylinder 6, which overheats because it sits farthest from the water pump. This guide covers the weak points, fuel-quality problems, Stage 2 tuning limits, and a pre-purchase checklist.

Engine Mechanical ⚡ Express

BMW B58 Engine: The Complete Owner’s Guide to Problems, Operation, and Maintenance

Complete guide to the BMW B58 engine: common problems, maintenance, and advice for BMW owners. Learn about turbo failures, the hybrid battery, cooling system, and transmission issues.

Engine Mechanical ⚡ Express

BMW B58 Engine: Complete Guide to Ownership, Problems, and Tuning

A complete guide to the BMW B58 engine: specs, maintenance, common problems and fixes, Stage 1–2+ tuning, and ownership tips. Learn how to extend the motor's life to 249,000 miles.

Engine Mechanical ⚡ Express

Tuning the BMW B58 in the G42: M240i — The Hidden Potential of the 3.0-Liter Engine

Tuning the BMW B58 in the G42 M240i—the hidden potential of the 3.0-liter engine. Covers the locked ECU, tuning methods (JB4, bootmod3), the stock turbo's power ceiling, fuel system limits, diagnostics, and maintenance.