The Lemon Index2018 BMW 3 Series.
The 2018 BMW 3 Series is one of the most reliable years by owner complaints: 22 complaints in its first 3 years and a Lemon Index of 26, where 100 is the average car. Owners complain most about engine, it has 1 recall, and it gets 25 to 36 mpg combined. The best BMW 3 Series year is 2022.
Before you buy. What matters most for this car.
Fixes owners look up most.
From 87 YouTube videos about the 2012–2018 BMW 3 Series (F30), 33.5M views. The 2018 is the same car.
What owners say it costs
- Other repairs (parts or shop quote)$23110 videos · most $160–$800Hear it ▶
- Lift / wheels / mods$6006 videos · most $260–$1,000Hear it ▶
- Tires$1,2504 videos · most $500–$2,000Hear it ▶
- Oil leak repair$503 videos · most $30–$600Hear it ▶
- Steering & suspension$7003 videos · most $90–$5,000Hear it ▶
Dollar amounts people say out loud in these videos (median, so one wild number can't swing it). Not verified sales; real prices depend on year, miles, condition and where you live. Tap Hear it to jump to the moment.
Most-watched topics
- Timing chain & engine2.3M views
BMW N20/N26 Timing Chain Replacement DIY Part 1 - Removal & Disassembly (328i, 320i, 228i, 428i, X1)FCP Euro · 765K views · 6 videos - Brakes & ABS1.6M views
How to Reset Maintenance/Service Light on BMW F30/F32 (Oil, Maintenance, Brakes)Boosty · 257K views · 8 videos - Oil changes & service1.4M views
oil service reset *HOW TO* 2014-2018 BMW(F30) 320i / 3 SeriesThe Driver Mod · 550K views · 4 videos - No-start: theft light, key & ignition1.2M views
NO START NO CRANK FIX BMW 325i 328i 335i 316i 318i 320i 335d 320d 318d 325xi 328xiWorld Mechanics · 1.1M views · 2 videos
Show 4 more
- Gauges, lights & wiring819K views
How to Install BMW Headlights Upgrade | F30 Projector LED | 328iFritz Ramos · 279K views · 4 videos - Oil leaks & gaskets608K views
BMW F30 Valve Cover Gasket Replacement DIY (BMW N20/N26 Engine)FCP Euro · 297K views · 3 videos - Transmission & shifter457K views
BMW F30 328i - 8HP Transmission Fluid Change - DIY(X1, X3, X4, X6, M235i, 320i XDrive, &More)FCP Euro · 457K views - Windows, doors & mirrors240K views
How to Replace STICKY Inner Door Pull Handles on your F30 BMW (BMW 320, 328, 330, 335 and 340)Kies Motorsports · 240K views
Before you buy, watch
5 Things I Wish I Knew Before Buying an "Unreliable" BMW 335i - You Need To Know This!Vehicle Virals · 560K views
BMW N55 Engine Diagnostics/Problems - Everything You Need To Know (X1, 135i, 335i, 435i, 535i)FCP Euro · 383K views
BMW 3 Series 2012-2018 (F30) used buyer's guide: specs, trims and common problemsAuto Express · 298K viewsViews show how many people looked up each fix, not how often it breaks. Videos belong to their creators; we link to them.
How serious. Out of 82 owner complaints, owners reported:
Every BMW 3 Series year. 2018 is highlighted. Lower is better.
What owners complain about most. From owner complaints to the government.
Share of this year's owner complaints filed with NHTSA, not the share of cars that break. One complaint can name more than one area.
When owners reported problems. From owner complaints to the government.
Most owners who filed a complaint with NHTSA had 7K to 57K miles on the car (29 complaints listed the miles). This shows when people who had a problem reported it, not the odds that your car will have it.
Recalls 1
- engine 2018
The crankshaft sensor may be equipped with incorrect firmware, preventing the sensor from properly processing input from the crankshaft reluctor ring, possibly resulting in a vehicle stall.
Recall repairs are free at any dealer. A recall only matters if it's still open on that exact car, so check its VIN.
Problems BMW told dealers about
BMW sent dealers 121 repair notes for this car. The ones about its biggest problems:
- BUZZING NOISE FROM VALVETRONIC MOTOR BEFORE OR AFTER ENGINE OPERATION: Buzzing noise may be heard
- SOS MALFUNCTION DISPLAYED This Service Information Bulletin (Revision 1) replaces SI B84 04 16…
- Ccm displayed "increased battery drain" caused by controller
Ask a seller or mechanic if these were done. Some are free under warranty or a special program.
Government investigations
- OpenHigh pressure fuel pump failure2023
- OpenDesiccated air bag inflator rupture2021
NHTSA looks into a problem when enough owners report it. Many end in a recall.
Safety
Crash test details
| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| BMW 3 Series SW AWD | ★★★★★ | ★★★★☆ | ★★★★★ | ★★★★★ |
| BMW 3 Series 4 DR AWD | ★★★★★ | ★★★★☆ | ★★★★★ | ★★★★★ |
| BMW 3 Series 4 DR RWD | ★★★★★ | ★★★★☆ | ★★★★★ | ★★★★★ |
| BMW 3 Series GT 5 HB AWD | ★★★★★ | ★★★★☆ | ★★★★★ | ★★★★★ |
Fuel cost and engines
About $2600–3200 a year in fuel (EPA estimate). Engines: 2.0L 4-cyl.
In owners' words
Crank hub will be prone to spin and therefore will destroy engine which will require a full engine replacement.
2018 BMW 3 Series owner · NHTSA complaint 11289976
Quick answers
Is the 2018 BMW 3 Series reliable?
Yes, it is one of the most reliable by government complaints. It drew 3.8× fewer complaints than average filed with NHTSA in its first 3 years, per car sold (Lemon Index 26; 100 is average, lower is better). The best BMW 3 Series year by this measure is 2022.
What are the most common 2018 BMW 3 Series problems?
In owner complaints to the government, the parts named most are engine (23%), electrical (18%) and fuel system, diesel (18%). That is the share of complaints, not the share of cars that break.
How many recalls does the 2018 BMW 3 Series have?
1 safety recall (latest: engine). Recall repairs are free at any dealer; check a specific car's VIN at nhtsa.gov/recalls.
What gas mileage does the 2018 BMW 3 Series get?
25 to 36 mpg combined, depending on the engine (EPA estimate).
Is the 2018 BMW 3 Series safe?
NHTSA gave it 5 out of 5 stars overall in its best tested version. Ratings differ by body style, and the full table is on the advanced page.
At what mileage do 2018 BMW 3 Series problems start?
Half of the owners who gave a mileage reported the problem between 7,800 and 57,600 miles. The middle report was at 20,000 miles, from 29 complaints.
Does the 2018 BMW 3 Series have transmission problems?
Transmission and drivetrain issues aren't among its top 5 complaint areas.
How much does the 2018 BMW 3 Series cost in fuel a year?
About $2600 to $3200 a year, by the EPA's current estimate.
What engines does the 2018 BMW 3 Series have?
2.0L 4-cyl.
What BMW 3 Series year is better than the 2018?
By owner complaints per car sold, the best recent years are 2022, 2019 and 2017.
Lemon Index = safety complaints filed with the U.S. government (NHTSA) in a car's first 3 years, per car sold, against the average car of the same model year. 100 is average; lower is better. A complaint is an owner's report, not a confirmed defect. How it works