Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 Z4 3.0I.
The 2003 BMW Z4 3.0I marked the debut of the E85 platform, a two-seat roadster that paired its sleek, contemporary body with a smooth 3.0-liter inline-six engine, requiring a substantial 6.9 quarts of oil to keep its internals protected across a range of viscosities. As the inaugural model year, it set the tone for the Z4’s blend of agility and refinement, though its reliability record—reflected in 414 owner complaints, with steering issues emerging as the most persistent concern, and four recalls—positions it as a model that demands careful maintenance to mitigate early teething problems. For researchers, this year serves as a foundational reference point, illustrating both the car’s strengths and the areas where subsequent updates would be necessary to solidify its long-term dependability.
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 48 · 570 CCA battery, OE oil filter 11421741000. 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 | 11421741000 alt 11427512300 |
| Engine air filter | 13721730449 |
| Fuel filter | 16117197690 |
| Spark plug | 12129071003 alt 12120037607 |
| Battery | 61217591080 |
| Front wiper blades | 61617079659 alt 61617054622 |
| Thermostat | 11537509357 alt 11537509227 |
| Cabin air filter | 64319195194 |
Engine, drivetrain, dimensions and economy.
| Overall length | 161 in |
| Overall width | 70.1 in |
| Overall height | 51.2 in |
| Wheelbase | 98 in |
| Curb weight | 2998 lb |
| Track (front / rear) | 58.3 / 59.8 in |
| Weight distribution (front / rear) | 64/36 |
Capacities, torques and tune-up values from the factory service manual.
This engine holds 6.9 qt of 15W-40 / 10W-40 / 10W-30 API SJ engine oil, DOT 4 brake fluid. Torque lug nuts to 88 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 |
| Engine Coolant | ETHYLENE GLYCOL |
| Engine Oil Capacity | 6.9 qt |
| Power Steering Fluid | ATF |
| Crankshaft Pulley and/or Damper Bolts | 302 ft-lbs |
| Crankshaft Pulley and/or Damper Bolts | 302 ft-lbs |
| Engine Flywheel Bolts | AT: 89 ft-lbs, MT: 78 ft-lbs |
| Engine Flywheel Bolts | AT: 89 ft-lbs, MT: 78 ft-lbs |
| Oil Pump to Cylinder BLock Bolts/Studs | 17 ft-lbs |
| Lug Nuts | 88 ft-lbs |
| Rear Wheel Hub | 221 ft-lbs |
| Cylinder Firing Order | 1-5-3-6-2-4 |
| Ignition Coil Primary Resistance | 0.8 ohms |
| Spark Plug Manufacturer | BMW |
| Refrigerant | R134a |
| Oil Group | PAG |
| Oil Type | 46 |
| Optional BCI Group Number | 94R Telematics |
| Optional BCI Cranking Performance | 640 Telematics cca |
| Standard BCI Group Number | 48 |
| Standard BCI Cranking Performance | 570 cca |
| Standard BCI Group Number | 48 |
| Pressure Test | 29.0 psi |
| Radiator Cap Pressure Relief | 26-30 psi |
| Thermostat Opening Temperature | 207 °F |
| Pressure Test | 29.0 psi |
| Radiator Cap Pressure Relief | 26-30 psi |
| Thermostat Opening Temperature | 207 °F |
| Engine Compression | 142-156 psi |
| Engine Oil Pressure | 10.5 |
| Brake Application | WITH SOLID ROTOR / WITH VENTED ROTOR |
| Torque Caliper to Bracket | 18-22 ft-lbs / 81 ft-lbs |
| Torque to Knuckle | 49 ft-lbs / 81-96 ft-lbs |
| Minimum Pad Thickness | Front: 0.079; Rear: 0.079 in |
| Brake Application | WITH SOLID ROTOR / WITH VENTED ROTOR |
| Rotor Minimum Machining | 0.031 in |
| Rotor Discard at or Under | 0.331 in / 0.685 in / 0.803 in |
| Rotor Finish | 0.5 - 3.5 μin |
| 1 | 14 ft. lbs., Step 2: 15 ft. lbs., Step 3: 70 | 14 ft. lbs |
| 1 | 4 ft. lbs., Step 2: 15 ft. lbs., Step 3: 70 | 4 ft. lbs |
| 1 | 29.5 ft. lbs. | 29.5 ft. lbs |
| 2 | 90 degrees | 90 degrees |
| 3 | 90 | |
| 1 | 29.5 ft. lbs. | 29.5 ft. lbs |
| 2 | 90.0 ft. lbs. | 90 ft. lbs |
| 3 | 90.0 ft. lbs. | 90 ft. lbs |
| 1 | 15 ft. lbs., Step 2: 70 | 15 ft. lbs |
| 1 | 15 ft. lbs., Step 2: 70 | 15 ft. lbs |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
Owner complaints about the 2003 BMW Z4 3.0I dominate in one area — the steering, 321 of 414 reports (78%), well ahead of the next concern. None of this vehicle's 4 recall campaigns target the steering, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 5 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the steering pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.
All 414 complaints on record, top 8 components.
Source: NHTSA Office of Defects Investigation complaint database.
Showing 2 of 4 campaigns on record for this vehicle.
ON CERTAIN PASSENGER VEHICLES, THE CONNECTION OF THE SAFETY BELT BUCKLE TO THE STEEL ROPE OF THE TENSIONER DOES NOT MEET BMW SPECIFICATIONS. IN SEVERE FRONTAL CRASHES, THIS CONNECTION CAN DETACH. Remedy: DEALERS WILL INSPECT BOTH FRONT SAFETY BELT TENSIONER AND BUCKLE ASSEMBLIES, AND IF NECESSARY, REPLACE THESE PARTS. OWNER NOTIFICATION BEGAN MARCH 19, 2003. OWNERS WHO TAKE THEIR…
ON CERTAIN PASSENGER VEHICLES, UNDER CERTAIN ENVIRONMENTAL CONDITIONS, A VAPOR LOCK IN THE FUEL PUMP COULD OCCUR CAUSING THE ENGINE TO STALL. IF THIS WERE TO HAPPEN, THE ENGINE WOULD NOT BE ABLE TO BE RESTARTED FOR… Remedy: DEALERS WILL INSTALL A RESISTOR IN THE ELECTRICAL LINE POWERING THE FUEL PUMP IN ORDER TO PREVENT AN OCCURRENCE OF VAPOR LOCK. THE RECALL BEGAN MAY 11, 2004. OWNERS SHOULD CONTACT…
Showing 5 of 45 bulletins on record with NHTSA.
| Bulletin | Date | Component | Summary |
|---|---|---|---|
| B510819 | 2024-01-16 | Electrical System | The basic conditions for initializing the power windows are not met. |
| B662419 | 2022-09-01 | Equipment | Vehicle cannot be opened or closed using comfort access, engine start is not possible… |
| B340414 | 2021-04-01 | Service Brakes, Air | Diagnosis of Compound Brake System Complaints in M Vehicles: 1. Visible cracks are caused… |
| B110208 | 2020-04-01 | Power Train | Power Reduction FC2A82 Intake VANOS and/or FC2 A87 Exhaust VANOS Camshaft Fault: The… |
| 513608 | 2019-07-10 | Electrical System | "Outside Door Mirror Moves when Locking or Unlocking the Vehicle. The door mirror tilts… |
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.
6.9 qt of HIGH PERFORMANCE MINERAL OILS: ABOVE 5 degrees F: 15W-40 API SJ, SL OR SM, -5 degreesF TO 68 degrees F: 10W-40 API SJ, SL OR SM, 5 degreesF TO 50 degrees F: 10W-30 API SJ, SL OR SM, BELOW 50 degrees F: 5W-30 API SJ, SL OR SM, BELOW 32 degrees F: 5W-20 API SJ, SL OR SM, HIGH PERFORMANCE SYNTHETIC OILS: 5W-40 API SJ, SL OR SM, per the factory manual.
NHTSA lists 4 recall campaign(s) for this model year. Check your specific vehicle by VIN.