Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2018 X3.
The 2018 BMW X3 pairs an Automatic (S8) transmission with EPA fuel-economy ratings of 20/27/23 mpg. Its reliability record reflects 72 owner complaints and 11 recalls, with the engine representing the top complaint area. Against the model’s 2004–2026 complaint history, which peaks at 373 for 2007 and bottoms out at 10 for 2023, the 2018 model year sits well below the worst showing yet remains significantly above the best. That placement positions it in a moderate reliability tier rather than at either extreme of the lineup’s historical range.
Fluid capacities, tune-up values and fuel economy at a glance.
Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.
From the factory this vehicle uses a BCI 94R · 800 CCA battery, OE oil filter 11425B3A1A5. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.
| Engine oil filter | 11425B3A1A5 alt 11428583896 |
| Engine air filter | 13718691835 alt 13718577171 |
| Spark plug | 12120040551 |
| Battery | 61216806755 alt 61217604808 |
| Front wiper blades | 61617469820 |
| Thermostat | 11538658571 alt 11538658574 |
| Cabin air filter | 64119382885 alt 64119382886 |
Engine, drivetrain, dimensions and economy.
| Transmission | Automatic (S8) |
| Overall length | 185.4 in |
| Overall width | 74.4 in |
| Overall height | 66.1 in |
| Wheelbase | 112.6 in |
| Curb weight | 4228 lb |
| Track (front / rear) | 63 / 63.8 in |
| Weight distribution (front / rear) | 50/50 |
| EPA city / highway / combined | 20 / 27 / 23 mpg |
| Drivetrain | All-Wheel Drive |
| Recommended fuel | Premium Gasoline |
0–60 mph, quarter-mile, horsepower and torque from independent road tests.
Independent road tests for the X3 of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.
| Year | Trim / engine | 0–60 | ¼ mile | HP | Drivetrain |
|---|---|---|---|---|---|
| 2018 | M40i 3.0L Turbo I-6 | 4.40 sec | 13.00 sec | 355 hp | AWD |
| 2018 | M40i (OZ Hyper GT HLT wheels + Michelin Pilot Sport 4S) 3.0L Turbo I-6 | 4.40 sec | 13.10 sec | 355 hp | AWD |
| 2018 | M40i 3.0L Turbo I-6 | 4.80 sec | 13.40 sec | 355 hp | AWD |
| 2018 | xDrive30i (Luxury) 2.0L Turbo I-4 | 6.20 sec | 14.90 sec | 248 hp | AWD |
| 2018 | xDrive30i (xLine) 2.0L Turbo I-4 | 6.30 sec | 14.80 sec | 248 hp | AWD |
| 2018 | xDrive30i (xLine) 2.0L Turbo I-4 | 6.50 sec | 15.00 sec | 248 hp | AWD |
| 2018 | xDrive30i (xLine) 2.0L Turbo I-4 | 6.70 sec | 15.10 sec | 248 hp | AWD |
| 2020 | M Competition 3.0L Twin-Turbo I-6 | 3.30 sec | 11.60 sec | 503 hp | AWD |
Capacities, torques and tune-up values from the factory service manual.
This engine DOT 4 brake fluid. Torque lug nuts to 103 ft-lbs. The firing order is 1-5-3-6-2-4. Note the cylinder-head bolts finish on a torque angle (torque-to-yield) — they stretch permanently and should be replaced, not reused, during any head service.
| Brake Fluid | DOT 4 |
| Clutch Fluid | DOT 4 |
| Crankshaft Position (CKP) Sensor Bolt(s) | 7.4 ft-lbs |
| Camshaft Position (CMP) Sensor Bolt(s) | 3.0 ft-lbs |
| Crankshaft Position (CKP) Sensor Bolt(s) | 9.0 ft-lbs |
| Camshaft Position (CMP) Sensor Bolt(s) | 7.4 ft-lbs |
| Camshaft Bearing/Carrier Cap Bolts or Studs | 14.0 ft-lbs |
| Oxygen (O2S) Sensor Bolt(s) | 35.0 ft-lbs |
| Knock Sense (KS) Bolt(s) | 18.0 ft-lbs |
| Oxygen (O2S) Sensor Bolt(s) | 35.0 ft-lbs |
| Lug Nuts | 103 ft-lbs |
| Cylinder Firing Order | 1-5-3-6-2-4 |
| Refrigerant | R134a |
| Refrigerant Capacity | 1.04-1.08 lbs. |
| Oil Group | PAG |
| Oil Type | 46 |
| Standard BCI Group Number | 94R |
| Standard BCI Cranking Performance | 800 cca |
| Standard BCI Group Number | 49 |
| Standard BCI Cranking Performance | 850 cca |
| RPM | 725.0 |
| RPM | 725.0 |
| RPM | 725.0 |
| 1 | 14.0 ft. lbs. | 14 ft. lbs |
| 2 | 70 degrees | 70 degrees |
| 3 | 70 | |
| 1 | 30.0 ft. lbs., Step 2: 120 degrees. Replace Screws | 30 ft. lbs |
Prep Do not reuse old bolts. Use new bolts coated with clean engine oil. Tighten all bolts to finger tight then continue on with the following procedure.
| 1 | 22.0 ft. lbs. | 22 ft. lbs |
| 2 | 90 degrees. | 90 degrees |
| 3 | 180 degrees | 180 degrees |
Prep Do not reuse old bolts. Use new bolts coated with clean engine oil. Tighten all bolts to finger tight then continue on with the following procedure.
| 1 | 13mm size head bolts | 22 ft. lbs |
| 2 | 13mm size head bolts | 37 ft. lbs |
| 3 | 13mm size head bolts | 90 degrees |
| 4 | 13mm size head bolts | 90 degrees |
| 5 | 13mm size head bolts | 90 degrees |
| 6 | 13mm size head bolts | 90 degrees |
| 7 | 11mm size head bolts | 22 ft. lbs |
| 8 | 11mm size head bolts | 90 degrees |
| 9 | 11mm size head bolts | 90 degrees |
| 10 | 11mm size head bolts | 90 degrees |
| 1 | Bolts 1-10 | 22 ft. lbs |
| 2 | Bolts 1-10 | 90 degrees |
| 3 | Bolts 1-10 | 180 degrees |
| 4 | 5 MB X 40 bolts front of cylinder head 14.7 | |
| 1 | 13mm screw head height bolts | 22 ft. lbs |
| 2 | 13mm screw head height bolts | 37 ft. lbs |
| 3 | 13mm screw head height bolts | 90 degrees |
| 4 | 13mm screw head height bolts | 90 degrees |
| 5 | 13mm screw head height bolts | 90 degrees |
| 6 | 13mm screw head height bolts | 90 degrees |
| 1 | 11mm screw head height bolts | 22 ft. lbs |
| 2 | 11mm screw head height bolts | 90 degrees |
| 3 | 11mm screw head height bolts | 90 degrees |
| 4 | 11mm screw head height bolts | 90 degrees |
| 1 | 7.4 ft. lbs. | 7.4 ft. lbs |
| 2 | 7.4 ft. lbs. | 7.4 ft. lbs |
| 3 | 11.8 ft. lbs. | 11.8 ft. lbs |
| 4 | 11.8 ft. lbs. | 11.8 ft. lbs |
| 5 | 11.8 | |
| 1 | 7.4 ft. lbs. | 7.4 ft. lbs |
| 2 | 7.4 ft. lbs. | 7.4 ft. lbs |
| 3 | 11.8 ft. lbs. | 11.8 ft. lbs |
| 4 | 11.8 ft. lbs. | 11.8 ft. lbs |
| 5 | 11.8 | |
| 1 | 18.0 ft. lbs. | 18 ft. lbs |
| 2 | 60 degrees | 60 degrees |
| 3 | 60 | |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
The 2018 BMW X3 marks a transitional point in its generation, with federal data revealing a notable shift in reliability patterns. Complaints dropped to 72—among the lowest in the second-generation cycle—while recalls spiked to 11, the highest since the 2010 model year, suggesting BMW proactively addressed emerging issues rather than reacting to owner reports. This contrasts with the 2017 model (92 complaints, 6 recalls) and the 2019 model (164 complaints, 10 recalls), where complaints rose sharply despite fewer recalls, indicating unresolved concerns. The 2018’s top complaint areas—engine (12), electrical system (7), and structure (7)—mirror trends seen in adjacent years, though the data doesn’t specify root causes. With only 4 crash-related complaints and 2 fire reports, safety incidents were minimal. The takeaway: the 2018 X3 appears to be a relatively strong year to buy, as its low complaint volume and high recall count suggest many potential issues were likely resolved under warranty.
All 72 complaints on record, top 8 components.
Source: NHTSA Office of Defects Investigation complaint database.
Showing 2 of 11 campaigns on record for this vehicle.
BMW of North America, LLC (BMW) is recalling certain 2018-2019 BMW X3 xDrive30i, X3 sDrive30i, and X3 M40i vehicles equipped with the "Active Lane Keeping Assistant" option. The steering wheel may be incompatible with… Remedy: BMW will notify owners, and dealers will inspect the steering wheel, replacing it if necessary, free of charge. The recall began on July 19, 2018. Owners may contact BMW customer…
BMW of North America, LLC (BMW) is recalling certain 2018-2019 BMW X3 sDrive30i, X3 xDrive30i, X3 M40i and certain 2019 X4 xDrive30i and X4 M40i vehicles. The rear brake caliper pistons on these vehicles may have an… Remedy: BMW will notify owners, and dealers will bleed the rear brake circuit, free of charge. The recall began August 31, 2018. Owners may contact BMW customer service at 1-800-525-7417.
Showing 5 of 388 bulletins on record with NHTSA.
| Bulletin | Date | Component | Summary |
|---|---|---|---|
| B010324 | 2026-05-06 | Engine | The EVAP systems purge (vent) valve limited warranty for defects in materials or… |
| B720325 | 2025-06-11 | Air Bags | The Supplemental Restraint Systems (SRS) Front Passenger’s Seat Occupancy Capacitive… |
| B720325 | 2025-05-01 | Air Bags | A situation may occur where the front passenger seat is not occupied. However, a “fasten… |
| B661719 | 2025-04-30 | Service Brakes | The vehicle applies the brakes on its own when reversing onto an inclined roadway or… |
| B720325 | 2025-04-09 | Electrical System | The Supplemental Restraint Systems (SRS) Front Passenger’s Seat Occupancy Capacitive… |
The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.
Decode factory build data for a specific vehicle by VIN.
Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.
Cross-vehicle references for the kinds of data on this page.
NHTSA lists 11 recall campaign(s) for this model year. Check your specific vehicle by VIN.
EPA figures are 20 city / 27 highway / 23 combined mpg.