2015 BMW 228i Convertible Maintenance Schedule & Service Intervals

Key Takeaways

• The 2015 BMW 228i Convertible is powered by either the N20 or N26 2.0-liter turbocharged inline-4 engine and is available in rear-wheel drive or xDrive all-wheel drive configurations.
• BMW employs a Condition Based Service (CBS) system that uses sensors and algorithms to determine maintenance needs based on actual driving conditions rather than fixed mileage for every item .
• The original 4-year/50,000-mile BMW Ultimate Service free maintenance program has long since expired for this model year.
• A critical timing chain warranty extension to 7 years/70,000 miles covers the N20/N26 engines in certain 2015 228i Convertible models, addressing a known issue with the timing chain and oil pump drive chain .
• BMW specifies a serpentine belt and tensioner replacement interval of 80,000 miles for the 2014-2016 228i.
• The cooling system (water pump, thermostat, hoses) should be serviced at a suggested interval of 80,000 miles.

Understanding the BMW Condition Based Service (CBS) System

The 2015 BMW 228i Convertible utilizes the Condition Based Service (CBS) system, which represents a departure from traditional fixed-interval maintenance schedules . Sensors and special algorithms evaluate the driving conditions of your vehicle and, based on this data, recognize the maintenance requirements .

What CBS Monitors

The system tracks various maintenance items and provides remaining time or distance information for:

• Engine oil service
• Front and rear brake pads
• Brake fluid
• Vehicle check
• Legally mandated inspections

How to Check Service Status

Detailed information on service requirements can be displayed on the Control Display . The system adapts the amount of maintenance corresponding to your user profile .

Service Data Storage

The maintenance system indicates required maintenance measures, providing support in maintaining road safety and the operational reliability of the vehicle. Replacement work, spare parts, fuels, lubricants, and wear materials are calculated separately .

Engine and Drivetrain Overview

The 2015 228i Convertible is equipped with either the N20 or N26 2.0-liter turbocharged inline-4 engine. The N26 engine is the SULEV (Super Ultra Low Emission Vehicle) version, primarily sold in California and other CARB states.

Engine Oil Specifications:

• BMW-approved synthetic oils meeting BMW Longlife-01 (LL-01) or LL-01 FE specifications
• Recommended viscosities include 5W-30, 0W-30, and 0W-40
• Always replace the oil filter when changing the oil

Owner Guidance: Pelican Parts recommends changing synthetic motor oil every 5,000 miles . While the CBS system may suggest longer intervals for normal driving, a conservative 5,000-mile interval is recommended by independent specialists for vehicles driven aggressively or in harsh conditions.

Factory Maintenance Schedule

Engine Oil Service

The CBS system determines engine oil change intervals based on driving conditions. The N20/N26 engines require BMW-approved synthetic oils meeting BMW Longlife-01 (LL-01) or LL-01 FE specifications .

Owner Guidance: Pelican Parts recommends changing synthetic motor oil every 5,000 miles and always replacing the filter when changing oil .

Serpentine Belt and Tensioner

Factory Interval: 80,000 miles

The N20/N26 engine features electric power steering and an electric water pump, so the belt drives only the alternator and A/C compressor, making the belt system small and straightforward.

Symptoms of a failing serpentine belt and tensioner:

• Squealing noise from the front of the engine
• Slapping noise from the front of the engine
• Alternator warning coming on inconsistently

Owner Guidance: The tensioner will also fail with age as the spring inside weakens. Replacing both the belt and tensioner together is recommended. If the belt fails, it will leave you without a charging system.

Cooling System Service

Suggested Interval: 80,000 miles

The N20 and N26 engine cooling system has known failure points. A comprehensive service kit is available that includes the water pump, thermostat assembly, mounting hardware, unique coolant hoses, and an upgraded metal hose connector.

Owner Guidance: To ensure proper operation and longevity, all related cooling system components should be replaced at the suggested interval of 80,000 miles, in conjunction with a proper cooling system flush and use of OE or Pentosin NF-G11 replacement coolant.

Brake Fluid Service

Factory Interval: Every 2 years

BMW requires brake fluid replacement every two years as a time-dependent service. This interval is critical for maintaining braking performance and preventing internal corrosion in the hydraulic system.

Spark Plugs

Factory Interval: Every 6th Engine Oil Service (approximately 60,000 miles)

Spark plugs should be replaced according to the CBS system's recommendations. For vehicles with aftermarket tuning or aggressive driving, more frequent replacement may be advisable.

Engine Air Filter

The engine air filter should be replaced according to the CBS system's recommendations. Maintaining the air filter at suggested service intervals results in better performance and improved fuel economy.

Cabin Microfilter

The activated carbon cabin microfilter should be replaced according to the CBS system's recommendations or based on time/mileage.

Vehicle Check

BMW specifies a comprehensive Vehicle Check as part of the maintenance schedule, including inspection of brake system connections, underbody components, steering components, coolant level and concentration, and a road test with checks of brakes, steering, and transmission .

Critical Technical Service Bulletin: Timing Chain (N20/N26 Engines)

BMW Service Bulletin SIB 11 03 17 addresses a known issue with the engine timing chain and oil pump drive chain on N20 and N26 engines .

Warranty Extension Coverage

BMW of North America extended the limited warranty for the engine timing chain and oil pump drive chain to 7 years/70,000 miles for eligible vehicles .

Affected 228i Convertible Models

Vehicles produced on or after March 1, 2015 are not included in this coverage .

Symptoms of Timing Chain Issue

• Whining noise from the lower engine area near the engine oil pump that increases frequency when increasing the engine RPM

Correction

If the noise is confirmed and authorization is provided, the repair includes:

• Replacing the engine oil pump drive chain module
• Replacing the timing chain
• Replacing timing chain tensioner, slide rail, tensioning rail, and guide rail
• Changing engine oil and filter

Important: This is a component-specific limited warranty extension, not a recall. There is no immediate repair required unless the vehicle is currently experiencing a problem with the timing chain and/or drive chain for oil pump .

Recommended Maintenance Planning Summary

Frequently Asked Questions

What engine does the 2015 BMW 228i Convertible have?

The 2015 BMW 228i Convertible is powered by either the N20 or N26 2.0-liter turbocharged inline-4 engine, depending on the emissions package.

How does the BMW Condition Based Service (CBS) system work?

CBS uses sensors and algorithms to evaluate driving conditions and calculate when service is required . It monitors engine oil, brake pads, brake fluid, vehicle check, and other maintenance items.

How often should I change the oil on my 2015 BMW 228i Convertible?

The CBS system determines the interval based on driving conditions. Pelican Parts recommends changing synthetic motor oil every 5,000 miles . The engine requires BMW Longlife-01 or LL-01 FE approved synthetic oil .

When should the serpentine belt be replaced on the 2015 BMW 228i?

BMW specifies a serpentine belt and tensioner replacement interval of 80,000 miles for the 2014-2016 228i.

When should the cooling system be serviced on the N20/N26 engine?

All related cooling system components should be replaced at a suggested interval of 80,000 miles, in conjunction with a proper cooling system flush and use of OE or Pentosin NF-G11 replacement coolant.

How often should the brake fluid be changed?

Brake fluid should be replaced every two years as a time-dependent maintenance item.

What is the timing chain issue on N20/N26 engines?

The N20 and N26 engines have a known issue with the timing chain and oil pump drive chain. BMW has extended the warranty for these components to 7 years/70,000 miles for eligible vehicles . Symptoms include a whining noise from the lower engine area that increases with RPM .

What was the original warranty on the 2015 BMW 228i Convertible?

The 2015 BMW 228i Convertible came with a 4-year/50,000-mile basic warranty and a 4-year/50,000-mile powertrain warranty, plus 4-year/unlimited-mile roadside assistance and a 4-year/50,000-mile maintenance program. The maintenance program has long since expired.

Does the 2015 228i Convertible have a service interval warning system?

Yes, the vehicle is equipped with a service interval warning system as part of the BMW maintenance system .