2018 BMW 740i xDrive Complete Maintenance Schedule & Service Guide

Key Takeaways

• The 2018 BMW 740i xDrive (G12 chassis) is powered by the B58 3.0L turbocharged inline-six engine and features xDrive all-wheel drive.
• BMW's Condition Based Service (CBS) system calculates maintenance needs based on actual driving conditions, with a service interval warning in the instrument cluster .
• Factory-scheduled maintenance milestones include spark plug replacement at 60,000 miles and oxygen sensor replacement at 120,000 miles (repeat at 150,000) .
• The B58 engine uses 6 spark plugs with part number 12120041666 and specifications including a 0.8 mm gap and M12 thread diameter .
• Brake system service is recommended at least once every 12,000 miles or 12 months ; brake pads typically last between 30,000 and 40,000 miles .
• Brake fluid should be checked and changed when indicated by the CBS system; dark or brown fluid indicates contamination and the need for immediate service .

Understanding BMW's Condition Based Service (CBS) System

The 2018 BMW 740i xDrive utilizes BMW's Condition Based Service (CBS) system, which calculates maintenance needs based on actual driving conditions rather than fixed schedules. Unlike traditional fixed interval maintenance, CBS uses onboard sensors to monitor actual component wear and driving conditions to determine when servicing is required.

How to Check CBS Status:

• The service interval warning is displayed in the instrument cluster
• Service status can also be checked through the iDrive system under Vehicle Information > Vehicle Status > Service Required

Understanding CBS Warning Indicators:

• Green – No service needed
• Yellow – Service due soon; schedule an appointment
• Red – Immediate service required

Factory Maintenance Schedule

The following maintenance intervals represent key factory-recommended milestones for the 2018 BMW 740i 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 . The 2018 740i xDrive uses the B58 3.0L turbocharged inline-six engine.

Oil Specifications:

• BMW LL-01 FE approved synthetic oil
• Oil meeting BMW specifications is required for the 2018 740i xDrive
• Viscosity should be selected based on climate and driving conditions as specified in your owner's manual

Oil Change Guidance:

BMW recommends changing your 2018 740i xDrive's oil at regular intervals. Your vehicle may need an oil change sooner if:

• The check engine 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

More frequent oil changes may be needed if you regularly haul heavy loads, drive in dusty conditions, go off-roading, or drive at low speeds for long distances.

Conservative Owner Guidance: Pelican Parts recommends changing your synthetic motor oil every 5,000 miles for optimal engine protection. Each oil change is also an opportunity to diagnose and treat other issues, such as worn brake pads or a failing battery. Always replace the oil filter when changing your oil.

Brake Fluid Service

Brake fluid is a hydraulic fluid specially formulated to withstand the extreme pressures and temperatures of your braking system. The 2018 BMW 740i xDrive uses DOT4 specification brake fluid.

Signs Brake Fluid Needs Attention:

• Brake fluid appears black or brown, indicating contamination
• Dark colors indicate the fluid has collected significant contamination and absorbed moisture
• If you notice dark brake fluid, it is well past time for a service

Service Guidance: Brake fluid deteriorates over time and eventually needs to be replaced with a brake system flush. Brake fluid should be checked and changed as part of regular brake service.

Brake System Service

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

Brake Pad Life: Brake pads often last between 30,000 and 40,000 miles depending on driving style and conditions. Factors like frequent highway driving and smooth braking can help brake pads last longer. Riding the brakes and hauling heavy loads can shorten their useful life.

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
• A feeling that something isn't right

Spark Plug Service

The 2018 BMW 740i xDrive uses 6 spark plugs for the B58 engine.

Spark Plug Specifications:

• OEM Part Number: 12120041666
• Thread Diameter: M12*1.25
• Gap Size: 0.8 mm
• Hex Size: 14 mm
• Resistance: 6±3K ohms
• Center Electrode: Iridium; Ground Electrode: Platinum

Service Interval: Spark plugs are recommended for replacement at 60,000 miles, with a repeat service at 120,000 miles.

Spark Plug Guidance: Keeping your spark plugs fresh is a very important part of keeping your car in top shape. Check for abnormal pitting or charred plug ends when replacing. Any strange variations among plugs may indicate an issue with a particular cylinder.

Oxygen Sensor Service

Service Interval: Oxygen sensors are scheduled for replacement at 120,000 miles, with a repeat service at 150,000 miles. Replacement helps maximize fuel economy and minimize exhaust pollution.

Long-Term Ownership Outlook

With proactive maintenance, a 2018 BMW 740i xDrive could be on the road well past the 200,000 mile mark. Staying on track with routine service appointments is one of the best ways to help extend your 740i xDrive's life, increase your vehicle safety, and help you avoid expensive repairs.

Regular maintenance is an investment that maintains the value and dependability of your car, extends its service life, and increases its resale value.