Honest, owner-tested DIY guides, common-problem breakdowns, and parts & tool picks for every BMW 3 Series — from the classic E30 to the current G20.
Start at your chassis hub for its common problems, DIY walkthroughs, and the exact parts and tools for the job.
The classic. Buying, restoration and keeping it on the road.
Cooling overhauls and budget DIY for a modern classic.
Cooling system, rear subframe and VANOS — the enthusiast favorite. Tons of cheap, satisfying DIY.
The modern, turbocharged 3 Series — N52, N54 and N55 problems by engine, plus service. Sedan to coupe.
The fully modern, turbocharged 3 Series — N20 timing chains, the superb B58, and easy service. Sedan, Touring and GT.
The current 3 Series — refined, tech-rich and turbocharged, with the B58 M340i the star. Sedan and Touring.
The first turbo M3 — the twin-turbo S55 super-sedan. Brilliant and tunable, with the crank hub and rod bearings to know.
The current M3 — bigger, faster and more usable, with the superb S58. Competition, xDrive and a manual all on the table.
Whether you're diagnosing a fault or about to turn a wrench, there's a path in.
Step-by-step repairs with the full parts and tool list linked for the job.
What actually goes wrong on each chassis — and how to fix it.
Tested picks for oil, brakes, tires, mats and more — best value first.
Scan tools, jacks and the kit every BMW owner should own.
The pages owners reach for first.
The right scan tool reads codes and registers a new battery — here are the picks that actually work on a 3 Series.
Read guide →The must-do job on every E46. Full parts list and a walkthrough that saves a four-figure shop bill.
Read guide →Everything you need — oil, filter, tools and torque specs — to do it right in your driveway.
Read guide →From the N20 timing chain to the superb B58 — the full F30 hub: problems by engine, DIY and buying.
Explore the F30 →The right LL-rated oil for your N-series or B-series engine, by family — no guesswork.
Read guide →The N54/N55 coupe owner's checklist — and the parts that keep it running strong.
Read guide →3 Series Guy is reader-supported. As an Amazon Associate we earn from qualifying purchases made through links on this site — at no extra cost to you. We only recommend parts and tools we'd use on our own cars.