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

Car Overview Overview

BMW 320d (G20): Model Overview and B47 Diesel Longevity

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Car Overview ⚡ Express

BMW E60 (2003–2010): The Complete Guide to Buying, Maintenance, and Common Problems

Complete guide to the BMW E60 (2003–2010): model overview, common engine problems (N52, N47, N62, M54), transmission, suspension, electrical, and body faults. A buyer's checklist plus maintenance tips to extend the car's service life.

Engine Mechanical ⚡ Express

BMW E90 N46B20 PCV Valve: Causes of Failure and Replacement

Learn why the PCV valve fails on the BMW E90 N46B20, the symptoms to watch for, and how to diagnose and replace it. Plus advice on part selection and prevention.

Engine Mechanical ⚡ Express

BMW B48 Engine: Reliability, Maintenance, and Tuning

The BMW B48 is one of the most reliable modern BMW engines. Here's what to know about its design, common problems, maintenance, and tuning—plus owner advice and a buying checklist.

Car Overview ⚡ Express

The Complete BMW X6 Tuning Guide: From E71 to F16 — Engines, Suspension, and Power Secrets

A complete BMW X6 tuning guide for the E71 and F16 generations: engines (N54, N55, N57, N63), chip tuning, suspension lowering, power secrets, and a used-buyer checklist.

Car Overview ⚡ Express

BMW F80 M3 / F82 M4 (S55): Complete Buyer’s and Maintenance Guide

A complete guide to buying and maintaining the BMW F80 M3 and F82 M4 with the S55 engine. Common problems, service intervals, a buyer's checklist, and tuning advice.

Car Overview ⚡ Express

BMW E60 M5: The Complete Guide to Buying, Maintaining, and Common Problems of the Legendary V10

The complete buying and ownership guide to the BMW E60 M5 and its S85 V10. Specs, common problems, maintenance costs, and a buyer's checklist.

Engine Mechanical ⚡ Express

BMW E60 N52 Coolant Pipe Repair: Why It Leaks and the Aluminum Fix

BMW E60 owners with the N52 engine deal with coolant leaks from a corroded steel pipe. Here's what causes it, how to diagnose it, and how to swap in an aluminum Sebek pipe yourself — saving over $4,000.

Buying Guide Overview

BMW X7 G07 xDrive30d: Used Buying Guide — What to Check and Whether It’s Worth It

Car Overview ⚡ Express

BMW E90 (2005-2011): Buying, Owning, and the Reliability Secrets of the Legendary 3 Series

The BMW E90 (2005-2011) is the iconic 3 Series and still the benchmark for handling. Inside: the N52, N54, N55, N47, and N57 engines, common problems, the maintenance schedule, and a pre-purchase checklist—plus how to extend the car’s life and avoid costly repairs.