2018 BMW 640i Gran Coupe Maintenance Schedule & Service Intervals

Key Takeaways

• The 2018 BMW 640i Gran Coupe (F06 chassis) is powered by the N55 3.0L turbocharged inline-six engine (engine code N55B30A) producing 315 horsepower and 330 lb-ft of torque .
• The vehicle is covered by BMW Ultimate Care—free scheduled maintenance during the first 3 years or 36,000 miles of ownership—and a standard 4 year/50,000-mile warranty .
• BMW's Condition Based Service (CBS) system is sensor-driven and cycles approximately every 10,000 miles; synthetic oil and filter changes occur every 10,000 miles or 12 months, whichever comes first .
• Spark plugs are recommended for replacement at 60,000 miles and again at 120,000 miles .
• Oxygen sensors are scheduled for replacement at 120,000 miles, with a repeat service at 150,000 miles .

Understanding BMW's Condition Based Service (CBS) System

The 2018 BMW 640i Gran Coupe 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 maintenance to your specific driving profile, considering factors such as trip length, engine temperature, and driving style .

BMW's maintenance guidelines are sensor-driven and center around the CBS system, which is cycled to occur every 10,000 miles . BMW utilizes electronic oil measurement to monitor the engine load on the current oil fill based on driving style and distances. If outside its specified operating range, a Check Control message is displayed on the vehicle's Control Display .

BMW Ultimate Care Coverage

The 2018 BMW 640i Gran Coupe was covered by BMW Ultimate Care, offering free scheduled maintenance during the first 3 years or 36,000 miles of ownership . The vehicle also carries a standard 4 year/50,000-mile warranty .

Included Services Under Ultimate Care:

• Engine oil and engine filter changes
• Brake fluid changes
• Spark plug changes
• BMW TeleService, which notifies BMW when your vehicle needs service

Engine Specifications & Capacities

The 2018 BMW 640i Gran Coupe is equipped with the N55 3.0L turbocharged inline-six engine (engine code N55B30A) .

OEM Factory Maintenance Schedule

The following maintenance intervals represent the recommended schedule for the 2018 BMW 640i Gran Coupe. Exact intervals may vary based on driving conditions and the CBS system.

Engine Oil and Filter Change

Synthetic oil and oil filter changes typically occur every 10,000 miles or 12 months, whichever occurs first . Coolants are also checked at the 10,000-mile mark .

Oil Specifications:

• BMW-approved synthetic oil (0W-20 recommended for all temperatures)
• Capacity with filter: 6.5 liters
• Oil drain plug torque: 18 ft/lbs (replace drain plug seal)

Conservative Owner Guidance: Motor oil is the single most important element in keeping your engine healthy . Independent specialists recommend changing synthetic motor oil every 5,000 miles for optimal engine protection . More frequent changes are advisable if you regularly drive in severe conditions such as frequent short trips, dusty environments, or aggressive driving. Always replace the oil filter and drain plug seal at every oil change.

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 640i Gran Coupe uses DOT4 Low Viscosity brake fluid (BMW P/N 83 13 0 443 024 for 0.5L or 83 13 0 443 026 for 1.0L) .

OEM Interval: Brake fluid should be flushed and replaced as indicated by the CBS system . A typical interval for brake fluid service on the 2018 640i Gran Coupe is approximately 30,000 miles (with repeats at 60,000, 90,000, 120,000, 150,000, 180,000, 210,000, and 240,000 miles) .

Conservative Owner Guidance: Brake fluid is hygroscopic—it absorbs moisture from the atmosphere over time, which lowers its boiling point and compromises braking performance. A conservative approach is to flush and replace brake fluid every 2 years regardless of mileage to maintain optimal braking performance and prevent corrosion in the brake system.

Coolant Service

The cooling system initial fill capacity is approximately 10 liters .

OEM Interval: Coolant should be flushed and replaced as indicated by the CBS system . A typical interval for coolant service on the 2018 640i Gran Coupe is approximately 60,000 miles (with repeats at 120,000 and 180,000 miles) .

Engine Air Filter Service

OEM Interval: Engine air filter replacement is indicated by the CBS system . A typical interval for engine air filter service is approximately 36,000 miles (with repeats at 72,000, 108,000, 144,000, and 180,000 miles) .

Spark Plug Service

The N55 engine uses high-performance spark plugs.

OEM Interval: Spark plugs are scheduled for replacement at 60,000 miles, with a repeat service at 120,000 miles . The 2018 BMW 640i Gran Coupe uses 6 spark plugs .

Conservative Owner Guidance: Spark plugs are small but vital parts—they provide the electric spark needed to start your car, and old spark plugs can prevent your car from starting at all. Some service providers recommend replacing spark plugs on time or about every 30,000 miles . Replace spark plugs on time or about every 30,000 miles . Spark plugs should always be replaced in sets (the N55 engine uses 6 spark plugs).

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.

Air Filter Replacement

Air filter replacement intervals are indicated by the CBS system. A typical interval for air filter service on the 2018 640i Gran Coupe is approximately 36,000 miles (with repeats at 72,000, 108,000, 144,000, and 180,000 miles) .

Transmission Service

The 2018 BMW 640i Gran Coupe uses the 8-speed GA8HP45Z automatic transmission with a total fill capacity of 8.5 liters .

Owner Guidance: Although BMW's official schedule may classify the transmission as "lifetime fill" under normal conditions, for owners planning long-term ownership, servicing the transmission at intervals indicated by the CBS system is advisable . If left unserviced, the automatic transmission fluid will break down, potentially causing poor shifting, slipping, and, ultimately, transmission failure.

Differential Fluid

The rear differential has a capacity of 0.8 liters . Differential fluid should be checked and changed as per the owner's manual recommendation.

Wheel Alignment

It is generally recommended to have wheel alignment checked approximately every 6,000 miles or 6 months . Signs that alignment may need attention include:

• The car pulling to the left or right
• Rapid or uneven tire wear on one or more tires
• A steering wheel that feels off center or crooked while driving straight ahead
• Noticeable squealing noises from your tires

Long-Term Ownership Outlook

With proper and diligent maintenance, a 2018 BMW 640i Gran Coupe has a good chance of hitting 200,000 miles or more . Staying on track with routine service appointments can help your 640i Gran Coupe perform better, keep you safer on the road, and help you avoid expensive repairs caused by common 2018 BMW 640i Gran Coupe problems later .

Scheduled maintenance services can vary depending on driving conditions, climate, and other factors; however, there's a good chance that your vehicle's recommended maintenance services will include oil changes, tire rotations, brake pad replacement, filter changes, and fluid checks and exchanges .

Regular maintenance is an investment that maintains the value and dependability of your car, extends its service life, and increases its resale value . With proactive maintenance, a 2018 BMW 640i Gran Coupe could hit 200,000 miles (or beyond!) .