Factory maintenance schedule OEM · verified
Normal service, condensed from the factory interval matrix.
Under the factory schedule, replace the spark plugs every 100,000 mi.
| Every 100,000 mi | Oxygen Sensor (replace) · Spark Plugs (replace) |
Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2005 Z4 2.5I.
The 2005 BMW Z4 2.5I emerges as a two-seat roadster built on the E85 platform, blending the brand’s signature driving dynamics with a more accessible inline-six engine that sips its 6.9 quarts of oil between changes. While its compact footprint and balanced chassis earned praise, this model year stands out in the Z4’s early reliability narrative for a relatively modest 190 owner complaints, with steering issues surfacing as the most persistent concern—though the absence of recalls suggests BMW had ironed out the most critical flaws by this point. For researchers, the 2005 variant represents a midpoint in the first-generation Z4’s maturation, offering a snapshot of a car that had moved past its initial teething problems but hadn’t yet benefited from the refinements that would come in later years.
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 47 · 480 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 | 98.4 in |
| Curb weight | 2932 lb |
| Track (front / rear) | 58.3 / 59.8 in |
| Weight distribution (front / rear) | 50/50 |
Capacities, torques and tune-up values from the factory service manual.
This engine DOT 4 brake fluid. Torque lug nuts to 88 ft-lbs, the oil drain plug to M12 Bolts: 18.0, M22 Bolts: 44.0 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.
| Automatic Transmission Fluid | See stamp |
| Brake Fluid | DOT 4 |
| Differential Gear Oil Capacity | 2.1 Pints |
| Engine Coolant | ETHYLENE GLYCOL |
| Engine Oil | SYNTHETIC |
| Engine Oil Capacity | 6.9 qt |
| Engine Oil | SYNTHETIC |
| Engine Oil Capacity | 6.9 qt |
| 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: 76 ft-lbs |
| Engine Oil Pan Drain Plug | M12 Bolts: 18.0, M22 Bolts: 44.0 ft-lbs |
| Oil Pump to Cylinder BLock Bolts/Studs | 17 ft-lbs |
| Oil Pump to Cylinder BLock Bolts/Studs | 17 ft-lbs |
| Lug Nuts | 88 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 |
| Standard BCI Group Number | 47 |
| Standard BCI Cranking Performance | 480 cca |
| Optional BCI Group Number | 94R Telematics |
| Optional BCI Cranking Performance | 640 Telematics cca |
| Standard BCI Group Number | 47 |
| 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 | 146-159 PSI. |
| Brake Application | WITH SOLID ROTOR / WITH VENTED ROTOR |
| Torque Caliper to Bracket | 18-22 ft-lbs |
| Torque to Knuckle | 49 ft-lbs / 81 ft-lbs |
| Minimum Pad Thickness | Front: 0.145; Rear: 0.145 pads |
| 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 | 4 ft. lbs., Step 2: 15 ft. lbs., Step 3: 70 | 4 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 |
Normal service, condensed from the factory interval matrix.
Under the factory schedule, replace the spark plugs every 100,000 mi.
| Every 100,000 mi | Oxygen Sensor (replace) · Spark Plugs (replace) |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
Owner complaints about the 2005 BMW Z4 2.5I dominate in one area — the steering, 166 of 190 reports (87%), well ahead of the next concern. NHTSA has issued no recalls for this vehicle, so these are owner-reported concerns only. 2 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 190 complaints on record, top 8 components.
Source: NHTSA Office of Defects Investigation complaint database.
No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.
Showing 5 of 43 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. |
| B611305 | 2024-01-11 | Electrical System | The electrical system of BMW vehicles has been subject to an ongoing development process… |
| 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… |
| B611305 | 2020-10-01 | Electrical System | Discharged Battery Energy Diagnosis Must Be Performed: The electrical system of BMW… |
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 USE ONLY BMW HIGH PERFORMANCE SYNTHETIC MOTOR OIL BMW PART NO. 07510009420 OR EQUIVALENT, per the factory manual.
NHTSA lists 0 recall campaign(s) for this model year. Check your specific vehicle by VIN.