2020 Bmw M4 Competition – Mastering Performance And DIY Maintenance
The 2020 BMW M4 Competition represents the final and most refined iteration of the F82 chassis, delivering 444 horsepower and a precision-tuned suspension. This guide provides actionable maintenance advice, technical insights, and performance tips to help owners maximize the longevity and power of this iconic machine.
If you have recently stepped into the cockpit of a 2020 bmw m4 competition, you already know it is more than just a car. It is a highly engineered tool designed for both the daily commute and the weekend track day. However, keeping this twin-turbo beast in peak condition requires more than just standard oil changes.
In this guide, we will dive deep into the S55 engine’s specific needs, address the common “crank hub” concerns, and outline a DIY-friendly maintenance schedule. Whether you are a seasoned mechanic or a weekend enthusiast, these insights will ensure your Ultimate Driving Machine stays exactly that. Let’s get under the hood and look at what makes this specific model year so special.
Understanding the S55 Engine in the 2020 bmw m4 competition
The heart of the 2020 bmw m4 competition is the S55 3.0-liter twin-turbocharged inline-six engine. While it shares some DNA with the standard N55, the S55 features a closed-deck block design for increased rigidity. This allows it to handle significantly higher boost pressures without compromising the engine’s structural integrity.
One of the standout features of this engine is its cooling system. It utilizes an indirect intercooler setup where a top-mounted water-to-air heat exchanger cools the intake charge. This system is incredibly efficient but requires regular monitoring of the secondary coolant reservoir to prevent heat soak during spirited driving.
As a DIYer, you should pay close attention to the S55 oiling system. It uses a magnesium oil pan and a sophisticated suction pump system to ensure the engine never starves for oil during high-G cornering. Always use a high-quality synthetic oil that meets BMW Longlife-01 (LL-01) specifications to protect these sensitive components.
The Importance of Oil Analysis
For high-performance engines like this, I highly recommend sending an oil sample to a lab like Blackstone Laboratories at every other change. This “blood test” for your engine can detect early signs of bearing wear or fuel dilution. It is a cheap way to gain peace of mind and catch potential issues before they become catastrophic.
Managing the Water-to-Air Intercooler
Check the coolant level in the smaller reservoir located near the firewall. If this level drops, it often indicates a leak in the internal core of the intercooler. If left unchecked, coolant can be sucked into the intake, leading to hydro-locking or significant internal engine damage.
Essential Maintenance for High-Performance Driving
Owning a 2020 bmw m4 competition means adhering to a more rigorous maintenance schedule than a standard 4 Series. While BMW suggests long intervals, experienced technicians recommend shortening them to preserve the high-strung components. Fresh fluids are the cheapest insurance policy you can buy for your car.
Oil changes should ideally occur every 5,000 to 7,000 miles. Use a 0W-30 or 5W-30 weight oil, and always replace the oil filter housing gasket if you spot any weeping. This is a common leak point that can drip oil onto the serpentine belt, causing it to slip or snap.
- Spark Plugs: Replace every 25,000 to 30,000 miles. The S55 is sensitive to plug gap, especially if you have a performance tune.
- Differential Fluid: The Active M Differential works hard to put power down. Change the fluid every 40,000 miles using 75W-140 synthetic gear oil.
- Brake Fluid: Because the M4 encourages hard braking, flush the system with DOT 4 fluid every two years to prevent moisture buildup and pedal fade.
Don’t forget the cabin and engine air filters. The M4 uses two engine air filters that are relatively easy to access. Replacing these ensures the twin turbos can breathe freely, maintaining that crisp throttle response the Competition model is known for.
DIY Spark Plug Replacement Tips
Replacing plugs on the S55 requires removing the carbon fiber strut brace and several plastic cowls. Use a 14mm thin-wall 12-point socket and be extremely careful not to cross-thread the plugs in the aluminum head. Torque them strictly to 23 Nm (approx 17 lb-ft) to ensure a proper seal without stripping the threads.
The Infamous Crank Hub and Plastic Charge Pipes
When discussing the 2020 bmw m4 competition, the “crank hub” issue is often the elephant in the room. The S55 uses a friction-fit crank hub design that can occasionally slip, especially on cars with increased torque from aftermarket tunes. If it slips, the engine’s timing is thrown off, which can lead to valve-to-piston contact.
While the failure rate is relatively low on stock cars, it is something to be aware of. Many owners opt for a crank hub capture plate as a preventative measure. This is a relatively simple DIY bolt-on that prevents the crank bolt from backing out, which is the primary cause of the hub spinning.
Another weak point is the factory plastic charge pipes. These carry pressurized air from the turbos to the intercooler. Under high boost, the plastic can crack or the clips can fail. Replacing these with aluminum charge pipes is a common and highly recommended “reliability mod” for any M4 owner.
Signs of a Failing Charge Pipe
If you experience a sudden loss of power, a “Drivetrain Malfunction” warning, and a loud whistling sound under acceleration, your charge pipe has likely cracked. Aluminum replacements offer a permanent fix and often include bungs for methanol injection if you decide to go that route later.
Should You Fix the Crank Hub?
If you plan on keeping the car stock and don’t drive it aggressively on the track, the risk is minimal. However, if you plan on adding a Stage 1 or Stage 2 tune, a keyed crank hub replacement is a wise investment. It is a labor-intensive job, so most owners have this performed by a specialized BMW performance shop.
Suspension and Braking: Keeping the Competition Sharp
The 2020 bmw m4 competition features the Adaptive M Suspension with specific springs, dampers, and anti-roll bars. This setup is significantly stiffer than the base M4. To maintain this handling precision, you must regularly inspect the suspension bushings and ball joints for signs of wear or tearing.
The braking system on the M4 is robust, featuring 4-piston front and 2-piston rear calipers. If your car is equipped with the standard “Blue” brakes, you will deal with a fair amount of brake dust. Switching to a high-quality ceramic pad can reduce dust while maintaining excellent street performance.
- Tire Pressure: Check this weekly. The M4 is very sensitive to tire pressure; even a 2 PSI difference can alter the car’s balance.
- Alignment: Get a professional alignment once a year. The aggressive factory camber settings can lead to premature inner tire wear if the toe is not perfectly set.
- Brake Rotors: Measure the thickness with a micrometer. M-compound rotors are expensive, so don’t replace them unless they are below the minimum thickness stamped on the hub.
If you track your car, consider upgrading to stainless steel braided brake lines. These provide a firmer pedal feel and prevent the “spongy” sensation that occurs when rubber lines expand under extreme heat. It is a straightforward DIY job that makes a noticeable difference in confidence during hard driving.
Choosing the Right Tires
The 2020 model usually came with Michelin Pilot Super Sport tires. For an upgrade, many owners move to the Michelin Pilot Sport 4S. This tire offers better wet grip and improved tread life without sacrificing the razor-sharp turn-in the M4 is famous for. Always look for the “Star Spec” (★) marking, which indicates the tire was specifically engineered for BMW M cars.
Interior Care and Technology Maintenance
Inside the 2020 bmw m4 competition, you are surrounded by carbon fiber and high-grade Merino leather. This leather is softer and more porous than standard automotive leather, meaning it requires regular conditioning to prevent cracking. Use a pH-neutral cleaner and a high-quality conditioner every three months.
The iDrive 6.0 system in the 2020 model is quite stable, but you should still check for map and software updates periodically. These can often be downloaded to a USB drive and installed via the port in the center console. Keeping the software current ensures compatibility with newer smartphones and improves GPS accuracy.
For the carbon fiber trim, avoid using harsh chemicals. A simple damp microfiber cloth followed by a dry one is usually enough to keep the gloss finish looking new. If the trim becomes scratched, a light hand polish with a fine finishing compound can often restore the mirror-like shine.
Protecting the Seat Bolsters
The Competition seats have aggressive side bolsters that are prone to wear as you slide in and out of the car. To preserve them, try to lift yourself over the bolster rather than sliding across it. Regularly applying a leather protectant will also help the leather remain supple and resist abrasion.
Frequently Asked Questions About 2020 bmw m4 competition
Is the 2020 M4 Competition a good daily driver?
Yes, the 2020 model is quite civilized in “Comfort” mode. The Adaptive M Suspension does a great job of soaking up road imperfections, though it remains firmer than a standard 4 Series. The trunk is spacious, and the rear seats are usable for short trips.
How can I tell if my M4 has the Competition Package?
The 2020 bmw m4 competition features several distinct visual cues. Look for the 20-inch Star-spoke 666M wheels, blacked-out “M4” badging on the trunk, high-gloss Shadowline trim, and the M-Stripe stitching on the seatbelts. The exhaust tips are also finished in black chrome.
What is the most common mechanical failure on this model?
Beyond the plastic charge pipes mentioned earlier, the most common “nuisance” issue is a leaking valve cover gasket. This usually manifests as a burning oil smell coming through the vents. It is a common BMW trait and typically occurs after the 50,000-mile mark.
Does the 2020 M4 have Apple CarPlay?
Yes, the 2020 model year came standard with Apple CarPlay compatibility. In many cases, it is wireless, allowing you to connect your phone seamlessly without needing a lightning cable. Android Auto, however, was not natively supported on this generation’s iDrive system.
Final Thoughts on the 2020 bmw m4 competition
The 2020 bmw m4 competition is a masterpiece of German engineering that rewards the attentive owner. By staying ahead of the maintenance curve and addressing known weak points like the charge pipes, you can enjoy the blistering performance of the S55 engine for years to come.
Remember that a car this capable deserves high-quality parts and fluids. Never cut corners on tires or oil, as these are the primary factors in how the car performs on the limit. Whether you are carving through mountain passes or simply enjoying the roar of the M-Sport exhaust on your way to work, take pride in maintaining one of the best driver’s cars ever made.
Keep your tools sharp, your fluids fresh, and your eyes on the apex. Stay safe and stay driven!
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