2018 BMW 740e xDrive Complete Maintenance Schedule & Service Guide

Key Takeaways

• The 2018 BMW 740e xDrive is a plug-in hybrid (PHEV) powered by a 2.0L turbocharged inline-four engine (B48) paired with an electric motor and xDrive all-wheel drive, with a service interval warning system to notify the driver when maintenance is due .
• BMW utilizes a Condition Based Service (CBS) system that calculates maintenance needs based on actual driving conditions, with service data stored in the vehicle's remote key fob .
• A conservative synthetic oil change interval of 5,000 miles is recommended by independent specialists for optimal engine protection .
• Spark plugs are recommended for replacement approximately every 30,000 miles .
• Brake pads typically last between 30,000 and 40,000 miles, and brake system service is recommended at least once every 12,000 miles or 12 months .
• The standard 12-volt battery generally needs replacement every 3 to 5 years; the high-voltage hybrid battery has different service considerations .

Understanding the BMW 740e xDrive Plug-In Hybrid System

The 2018 BMW 740e xDrive is BMW's flagship plug-in hybrid sedan, combining a 2.0L turbocharged inline-four gasoline engine (B48) with an electric motor and the xDrive all-wheel-drive system . This iPerformance model represents BMW's technology transfer from the BMW i division to the core brand, offering locally emission-free driving without compromising BMW driving pleasure.

The vehicle operates using the BMW Condition Based Service (CBS) system, which monitors driving conditions and calculates maintenance needs accordingly. The system includes a service interval warning that alerts the driver when maintenance is due .

PHEV-Specific Considerations :

• The high-voltage battery and electric motor components require specialized diagnostics
• The hybrid system uses both a conventional 12-volt battery and a high-voltage battery
• High-voltage service work requires specialized training and safety procedures
• Certain high-voltage components are only available as part of larger assemblies

OEM & Recommended Maintenance Schedule

BMW's maintenance guidelines are sensor-driven and center around the CBS system. The following intervals represent key maintenance milestones for the 2018 BMW 740e xDrive. Exact intervals are determined by the vehicle's CBS system based on driving conditions .

Engine Oil and Filter Change

Motor oil is the single most important element in keeping your engine healthy and helping it to enjoy a long life . The 2018 740e xDrive uses the B48 2.0L turbocharged inline-four engine.

Oil Specifications:

• BMW-approved synthetic oil
• Common viscosity: 5W-30 or 0W-20 (refer to owner's manual for climate-specific recommendations)
• Always replace the oil filter when changing your oil

Oil Change Guidance:

BMW recommends changing your 2018 740e xDrive's oil at regular intervals as determined by the CBS system. Your 740e xDrive may need an oil change sooner if :

• The check engine/oil change light is on
• You hear knocking sounds coming from the engine
• You sense an oil smell in the cabin
• You see an excess amount of vehicle exhaust

Conservative Owner Guidance: Independent specialists recommend changing your synthetic motor oil every 5,000 miles for optimal engine protection . More frequent oil changes may be needed if you regularly haul heavy loads, drive in dusty conditions, or drive at low speeds for long distances .

High-Mileage Consideration: If your 740e xDrive has passed 75,000 miles, some references suggest considering switching to high-mileage oil at your next oil change .

PHEV Consideration: The 740e xDrive's plug-in hybrid system allows for significant electric-only driving, which can extend engine oil life in some cases. However, the CBS system still requires an oil change at least once per year.

Spark Plug Service

Spark plugs are one of the key components of your vehicle's ignition system, igniting gasoline and air inside of your engine . They are small but vital parts—they provide the electric spark that your car needs in order to start .

Service Interval: Some references recommend replacing spark plugs approximately every 30,000 miles . Replacing spark plugs on time helps maintain engine performance, fuel economy, and reliable starting.

Symptoms of Spark Plug Issues :

• Difficulty starting your car
• Check engine light for a misfire code
• Reduced fuel economy and/or power
• Rough idle and/or unexplained engine vibration
• Failed emission testing

Spark Plug Guidance: Even if only one spark plug is found to be faulty, they should always be replaced in sets .

Brake System Service

BMW generally recommends that at a minimum, front and rear brakes are removed and serviced at least once every 12,000 miles or 12 months, including checking the parking brake .

Brake Pad Life: The majority of brake pads last between 30,000 and 40,000 miles. Factors like frequent highway driving and smooth braking can help brake pads last longer. Hauling heavy loads and riding your brakes can shorten their useful life .

Regenerative Braking Benefit: The 740e xDrive's hybrid system uses regenerative braking, which can extend conventional brake pad life under normal driving conditions.

Signs of Brake Issues :

• Unusual noises (squealing or grinding)
• Vibration or pulsation in the steering wheel or pedal
• A burning smell near the tires
• Illuminated brake dashboard warning light

Brake Fluid Service

Brake fluid is a hydraulic fluid specially formulated to withstand the extreme pressures and temperatures of your braking system. Over time, brake fluid absorbs air, moisture, sludge, and other contaminants .

Fluid Guidance: In a normal system, the brake fluid is clear or very light gold in color. Very dark colors indicate significant contamination and moisture absorption, which reduces the system's ability to build pressure and compromises braking performance .

Signs Brake Fluid Needs Attention :

• Brake fluid appears black or brown (it should be clear or light gold)
• Brake pedal feels softer or spongy
• You may have to pump the pedal for it to work properly

Recommended Interval: Brake fluid should be flushed and replaced every 2 years or as indicated by the CBS system.

Transmission Service

According to BMW, your 740e xDrive's transmission should be checked regularly for wear and tear, and transmission and differential fluids should be exchanged at regular intervals with BMW-approved products .

Recommended Interval: Some technicians suggest that between 30,000 and 60,000 miles is a good timeframe for having your BMW's transmission fluid checked and replaced, but that timeline can vary depending on how your vehicle is used .

Transmission Warning Signs :

• Shifting delays
• Grinding or jumping during acceleration
• Car shaking on the road
• Burning smell or whistling sounds from under the hood
• Decreased fuel economy

Cooling System Service

The radiator is in the cooling system of your car and helps your engine temperature stay within a safe range . Staying on top of routine radiator maintenance is crucial to keep your engine in the best possible shape .

Signs of Cooling System Issues :

• Coolant leaks under your car
• High engine temperatures
• Dashboard light that indicates low coolant
• Overheating

Recommended Interval: BMW recommends replacing antifreeze or coolant at scheduled intervals . If the coolant surge tank is cracked or broken, coolant will leak onto the ground and an airlock will form in the cooling system .

Cooling System Components :

• Radiator
• Water pump
• Thermostat
• Hoses and connections
• Coolant reservoir/surge tank

PHEV-Specific Maintenance Considerations

The 2018 BMW 740e xDrive's plug-in hybrid system requires additional attention beyond conventional engine maintenance :

High-Voltage Battery Care:

• Battery health diagnostics may be performed during routine service visits
• The high-voltage battery should be checked as part of overall electrical system inspections
• Proper charging habits help maximize battery longevity

Auxiliary Battery: The auxiliary battery supports essential electronics including the start/stop system. Signs of auxiliary battery failure include electrical issues, warning messages, and difficulty with system startups .

Hybrid System Diagnostics :

• High voltage cable inspections check for damage to cable jackets and connectors
• Isolation tests may be performed to check for high voltage leaks
• Power electronic system health checks review the electric drive motor, power inverter, and regenerative braking system

Important Service Note: High-voltage service work requires specialized training and safety procedures. Certain high-voltage components are only available as part of larger assemblies .

Battery Care

Batteries generally need to be replaced every three to five years. Your 740e xDrive may need a replacement sooner depending on your driving habits and climate. Extremely hot or cold temperatures can take a toll on your BMW 740e xDrive battery, and so can frequent short drives .

Battery Warning Signs :

• Car has trouble starting
• Visible deposits or corrosion on the battery
• Signs of wear on the battery cables

Note: The 740e xDrive has both a standard 12-volt battery and a high-voltage hybrid battery. Each has different service requirements and replacement costs.

Wheel Alignment

It is generally recommended to have wheel alignment checked approximately every 6,000 miles or 6 months .

Signs Alignment May Need Attention :

• A feeling that your car pulls to one side
• Rapid or uneven tire wear
• A steering wheel that feels off center or crooked while driving straight
• Tires that squeal frequently

Long-Term Ownership Outlook

With proactive maintenance, a 2018 BMW 740e xDrive could be on the road well past the 200,000 mile mark . Staying on track with routine service appointments can help your 740e xDrive perform better, increase your vehicle safety, and help you avoid expensive repairs .

PHEV-Specific Considerations:

• Hybrid battery replacement is a significant out-of-warranty expense
• Regenerative braking extends conventional brake pad life
• Complex hybrid systems require specialized diagnostics and repair

Regular maintenance is an investment that maintains the value and dependability of your car, extends its service life, and increases its resale value. Good maintenance should never be viewed as an expense—it is an investment in the longevity and reliability of your BMW.