2018 BMW 640i xDrive Gran Turismo Service Schedule & Maintenance Guide

Key Takeaways

• The 2018 BMW 640i xDrive Gran Turismo (G32 chassis) is powered by the B58 3.0L turbocharged inline-six engine, with an oil capacity of 6.5 liters .
• BMW utilizes a Condition Based Service (CBS) system that uses sensors and driving data to calculate maintenance needs based on actual driving conditions rather than fixed intervals.
• Factory-recommended maintenance intervals include spark plugs at 60,000 miles, and oxygen sensors at 120,000 and 150,000 miles .
• The vehicle uses DOT4 specification brake fluid; dark or brown fluid indicates contamination and the need for immediate service .
• The ZF 8HP automatic transmission is recommended by the manufacturer for service at 50,000-mile intervals, with shorter 30,000-mile intervals for modified or track-driven vehicles .
• A conservative synthetic oil change interval recommended by independent specialists is 5,000 miles for optimal engine longevity .

Understanding BMW's Condition Based Service (CBS) System

The 2018 BMW 640i xDrive Gran Turismo utilizes BMW's Condition Based Service (CBS) system. Unlike traditional fixed-interval maintenance schedules, CBS uses sensors and algorithms that take into account the driving conditions of your vehicle to determine when maintenance is required. The system adapts the amount of maintenance to your specific driving profile, considering factors such as trip length, engine temperature, and driving style.

Scheduled maintenance services can vary depending on driving conditions, climate, and other factors. Routine maintenance typically includes oil changes, tire rotations, brake pad replacement, filter changes, and fluid checks and exchanges . Staying on track with routine service appointments can help your vehicle perform better, keep you safer on the road, and help you avoid expensive repairs .

Engine Specifications

The 2018 BMW 640i xDrive Gran Turismo is equipped with the B58 3.0L turbocharged inline-six engine .

Factory Maintenance Schedule

The following maintenance intervals represent the key factory-recommended milestones for the 2018 BMW 640i xDrive Gran Turismo. Exact intervals are determined by the vehicle's CBS system based on driving conditions .

60,000 Mile Service

At 60,000 miles, the key scheduled maintenance item is replacing the spark plugs :

• Replace Spark Plugs

120,000 Mile Service

At 120,000 miles, multiple key services are recommended :

• Replace Spark Plugs
• Replace Oxygen (O2) Sensor

150,000 Mile Service

At 150,000 miles, the oxygen sensors require replacement again :

• Replace Oxygen (O2) Sensor

Engine Oil and Filter Change

Motor oil is the single most important element in keeping your engine healthy . The B58 engine has an oil capacity of 6.5 liters . BMW's CBS system will indicate when an oil service is due, with typical intervals determined by driving conditions.

Oil Specifications:

• BMW-approved synthetic oil
• The specific viscosity should be selected based on climate and driving conditions as specified in your owner's manual

Owner Guidance: More frequent oil changes are advisable if you regularly haul heavy loads, drive in dusty areas, or drive at low speeds for long distances . Generally, being extra-diligent about oil changes won't damage your BMW. In fact, more frequent oil changes give technicians more opportunities to catch and alert you to any issues, like worn brake pads or a weak battery .

Signs Your Vehicle May Need an Oil Change Sooner :

• Check engine/oil change light is illuminated
• Knocking sounds from the engine
• Oil smell inside the vehicle
• Excess amount of vehicle exhaust

Spark Plug Service

Spark plugs are used to ignite the fuel-air mixture in the engine's combustion chamber . They are small but vital parts—they provide the electric spark that your car needs in order to start .

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

Spark Plug Specifications :

• Part Reference: SILZKGR8B8S
• Thread Diameter: M12*1.25
• Gap Size: 0.8 mm
• Hex Size: 14 mm
• Reach: 26.5 mm
• Resistance: 6±3K ohms
• Quantity: 6 plugs

Owner Guidance: Check for abnormal pitting or charred plug ends when replacing plugs, and compare each plug against each other—any strange variations among plugs are a sure indicator that something is wrong with a particular cylinder .

Oxygen Sensor Service

OEM Interval: Oxygen sensors are scheduled for replacement at 120,000 miles, with a repeat service at 150,000 miles . Oxygen sensors deteriorate on a mileage basis, and replacement helps maximize fuel economy and minimize exhaust pollution.

Brake Fluid Service

Brake fluid is essential for the operation of a car's brakes . Over time, brake fluid absorbs air, moisture, sludge, and other contaminants . The 2018 BMW 640i xDrive Gran Turismo uses DOT4 specification brake fluid .

Guidance: If you notice that your brake fluid appears black or brown, it is well past time for a service . Very dark colors indicate that your fluid has collected a significant amount of contamination and might have absorbed moisture, which reduces the system's ability to build pressure and compromises braking performance .

Signs You May Need a Brake Fluid Flush :

• Brake fluid appears black or brown, indicating contamination
• Brake pedal feels softer or spongy
• You may have to pump the pedal a couple of times for it to work properly

Brake System Service

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

Brake Pad Life: In general, brake pads last from 30,000 to 40,000 miles. Factors like driving mostly on highways and braking smoothly can help your brake pads last longer. If you often haul heavy loads or ride your brakes, your brake pads may wear out sooner .

Signs of Brake Issues :

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

Transmission Service

The 2018 BMW 640i xDrive Gran Turismo uses a ZF 8HP automatic transmission (8HP45Z, 8HP50Z, 8HP70Z, or 8HP75Z variants) .

Owner Guidance: Over the life of a vehicle, the transmission can often be overlooked when performing routine maintenance. If left unserviced, the automatic transmission fluid will break down, causing the valve body and filter to become contaminated with deposits and sludge. This will lead to poor shifting, slipping, and, ultimately, transmission failure .

As per ZF's recommendations, performing a full service on your 8HP automatic transmission every 50,000 miles is suggested. If your vehicle is modified and makes more power than stock or if your vehicle is regularly track-driven, shorter 30,000-mile service intervals are recommended .

Wheel Alignment

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

Signs Alignment May Need Attention :

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

Unlike with other potential issues, you won't see any dashboard warning lights if your wheel alignment needs attention .

xDrive-Specific Maintenance

The xDrive all-wheel-drive system includes both front and rear differentials and a transfer case. These components require periodic fluid service using BMW-approved fluids. Service intervals are determined by the CBS system. BMW recommends exchanging differential and transmission fluids at certain intervals with BMW-approved transmission fluid .

Long-Term Ownership Outlook

With proactive maintenance, a 2018 BMW 640i xDrive Gran Turismo could be on the road well past the 200,000 mile mark . Staying on track with routine service appointments can help your vehicle perform better, decrease your risk of dangerous malfunctions on the road, 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.