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 F80 M3: Full Breakdown of the S55 Engine, Problems, and Tuning

A complete guide to the BMW F80 M3: the S55 engine, common problems (crank hub, intercooler leaks, J-pipe, differential bushing), maintenance advice, a used-buyer checklist, and tuning potential. Find out whether the F80 M3 is worth buying in 2024.

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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 M3 F80: Complete Guide to the S55 Engine, Problems, and Maintenance

Complete guide to the BMW M3 F80: S55 engine specs, common problems (rod bearing wear, oil leaks, HPFP failure), maintenance intervals, and a checklist for buying a used car.

Engine Mechanical ⚡ Express

BMW M3 F80: Complete Guide to the S55 Engine, Problems, and Tuning

Complete guide to the BMW M3 F80: S55 3.0L specs, common problems (crankshaft damper, intercooler, J-pipe, differential bushing), tuning stages from Stage 1 to 700+ hp, and a checklist for buying used.

Engine Mechanical ⚡ Express

BMW F80 M3: Complete Guide to the S55 Engine, Problems, and Tuning

A complete guide to the BMW F80 M3: the S55 engine, common problems (crank hub, intercooler leaks), maintenance advice, a buying checklist, and tuning stages from Stage 1 to Stage 2. Learn how to extend your M3's life and avoid expensive failures.

Engine Mechanical ⚡ Express

The BMW S55B30 Engine: Problems, Maintenance, and Tuning for BMW M Owners

The BMW S55B30 is a powerful twin-turbo inline-six built for BMW M models. Specs, weak spots (the central crankshaft bolt), maintenance, and tuning.

Engine Mechanical ⚡ Express

BMW 4 Series (F32/F33/F36) Chip Tuning: The Complete Stage 0–2 Guide

A complete guide to BMW 4 Series (F32/F33/F36) chip tuning: engines, Stage 0–2 power gains, installation specifics, reliability, and a pre-purchase checklist.

Engine Mechanical ⚡ Express

BMW F80 M3 S55: The Complete Guide to the Engine, Problems, and Tuning

Full guide to the BMW F80 M3's S55 engine: specs, common problems, prevention, and tuning from Stage 1 to Stage 2+. Plus a used-car buying checklist.

Engine Mechanical ⚡ Express

BMW S55: Weak Points, Maintenance, and Reliability Secrets for Owners

The BMW S55 twin-turbo inline-six is a legend, but it has known problems: the crank hub, oil leaks, turbos, and the DCT. Learn the weak spots, the maintenance that matters, and what to check before buying a used car.

Engine Mechanical ⚡ Express

BMW F80 M3: Complete Guide to the S55B30 Engine, Problems, and Buying Used

A complete guide to the BMW F80 M3: S55B30 engine traits, common problems (HEX gear, timing chain, catalytic converters), maintenance, a used-buying checklist, and ownership costs—plus whether the legendary M3 is worth buying in 2025.