Mercedes SL 420 Workshop Manuals and Repair Manuals
Every Manual available online - found by our community and shared for FREE. Enjoy!
Mercedes SL 420
The Mercedes-Benz SL-Class (formerly known as the SL Roadster) is a grand tourer manufactured by Mercedes since 1954. The term SL-Class refers to the marketing variations of the vehicle, including the numerous engine configurations spanning six design generations. Mercedes SL 420 was manufactured as a 2 door cabriolet between 1985 and 1989. It was made with 4,196 cc petrol engines, and available only with automatic transmission style. This model has top speed listed as 213 km/h, and can accelerate from 0 to 100 km/h in 9.0 seconds.
Mercedes SL 420 FAQ's
How do I change the oil in a Mercedes SL 420?
To change the oil in a Mercedes SL 420, start by locating the oil drain plug underneath the engine. Remove the plug using a wrench, and allow the old oil to drain completely. Replace the drain plug, and then proceed to remove the oil filter using an oil filter wrench. After installing a new oil filter, pour the recommended amount and type of oil into the engine through the oil filler cap.
How do I check the transmission fluid level in a Mercedes SL 420?
Checking the transmission fluid level in a Mercedes SL 420 requires the engine to be running and the transmission to be warmed up. With the vehicle parked on a level surface, locate the transmission dipstick, usually near the back of the engine compartment. Pull out the dipstick, wipe it clean, reinsert it fully, and then pull it out again to check the fluid level. The fluid should be within the designated range indicated on the dipstick.
How do I jump-start a Mercedes SL 420?
To jump-start a Mercedes SL 420, park a running vehicle with a similar voltage battery close to the SL 420. Connect the positive (+) jumper cable to the positive terminal of the dead battery, and then connect the other end to the positive terminal of the donor vehicle's battery. Next, connect the negative (-) jumper cable to the negative terminal of the donor vehicle's battery, and then attach the other end to an unpainted metal surface on the SL 420, away from the battery. Start the donor vehicle and let it run for a few minutes, then attempt to start the SL 420. Once started, carefully remove the jumper cables in the reverse order.
How do I program a key fob for a Mercedes SL 420?
To program a key fob for a Mercedes SL 420, insert the key into the ignition and turn it to the "on" position without starting the engine. Within 10 seconds, press and release the lock or unlock button on the key fob. Repeat this step for any additional key fobs that need to be programmed. Turn the key to the "off" position and remove it from the ignition. Test the functionality of the programmed key fob by locking and unlocking the doors.
How do I replace a battery in a Mercedes SL 420?
To replace the battery in a Mercedes SL 420, start by turning off the ignition and all electrical components. Open the hood and locate the battery, usually positioned in the engine compartment. Disconnect the negative (-) cable first, followed by the positive (+) cable, using a wrench or pliers. Remove any retaining bracket or strap holding the battery in place, and then lift the old battery out. Place the new battery into position, securing it with the bracket or strap. Reconnect the positive cable first, followed by the negative cable, ensuring they are tightened securely.
How do I replace a headlight bulb in a Mercedes SL 420?
To replace a headlight bulb in a Mercedes SL 420, open the hood and locate the back of the headlight assembly. Disconnect the electrical connector from the bulb by gently pulling it off. Remove the retaining clip or ring that holds the bulb in place, and then carefully pull out the old bulb. Insert the new bulb, ensuring it is properly aligned, and secure it with the retaining clip or ring. Reconnect the electrical connector and test the new bulb before closing the hood.
How do I replace a spark plug in a Mercedes SL 420?
To replace a spark plug in a Mercedes SL 420, start by disconnecting the negative (-) battery cable to prevent any accidental electrical discharge. Locate the spark plug wires or ignition coils, depending on the engine configuration. Remove the wire or coil from the spark plug by pulling it straight out. Use a spark plug socket and a ratchet to loosen and remove the old spark plug. Install the new spark plug, ensuring it is tightened to the recommended torque, and then reconnect the wire or coil. Repeat these steps for each spark plug. Finally, reconnect the negative battery cable.
How do I replace a windshield wiper blade in a Mercedes SL 420?
To replace a windshield wiper blade in a Mercedes SL 420, lift the wiper arm away from the windshield until it locks in a raised position. Locate the release tab or button on the wiper blade assembly and press it to release the old blade. Slide the old blade off the wiper arm, and then attach the new blade by sliding it onto the wiper arm until it clicks into place. Carefully lower the wiper arm back onto the windshield.
How do I replace the cabin air filter in a Mercedes SL 420?
To replace the cabin air filter in a Mercedes SL 420, locate the filter housing, usually located behind the glove compartment or under the dashboard. Open the housing by releasing the retaining clips or removing the screws, depending on the design. Take out the old filter and replace it with a new one, ensuring proper alignment. Close the housing securely, and test the air conditioning and ventilation system to verify proper airflow.
How do I reset the maintenance light on a Mercedes SL 420?
To reset the maintenance light on a Mercedes SL 420, insert the key into the ignition and turn it to the "on" position without starting the engine. Within the first 4 seconds, press the trip reset button twice quickly. Then, turn the key to the "off" position and remove it. When you start the vehicle again, the maintenance light should be reset.
How do I troubleshoot a non-working power window in a Mercedes SL 420?
If a power window in a Mercedes SL 420 is not functioning, there are a few troubleshooting steps to follow. First, check the window switch for any signs of damage or corrosion. If the switch appears to be in good condition, test the window motor by applying a direct power source to it. If the motor operates, the issue may lie with the switch or wiring. If the motor does not respond, it may need to be replaced. Additionally, inspect the fuse associated with the power window circuit and replace it if necessary.
How often should I replace the brake pads on a Mercedes SL 420?
The frequency of brake pad replacement on a Mercedes SL 420 depends on various factors, including driving habits, road conditions, and pad material. As a general guideline, brake pads should be inspected at regular intervals, typically every 10,000 to 15,000 miles. If the brake pads are worn below the recommended thickness, they should be replaced promptly to ensure safe braking performance.
What is the recommended engine oil for a Mercedes SL 420?
The recommended engine oil for a Mercedes SL 420 depends on the model year and engine type. It is crucial to consult the owner's manual or the manufacturer's specifications to determine the appropriate oil viscosity and quality. Typically, Mercedes-Benz recommends using synthetic oil with a viscosity grade of 0W-40, 5W-40, or 5W-30, meeting the specifications outlined in the manual.
What is the recommended tire pressure for a Mercedes SL 420?
The recommended tire pressure for a Mercedes SL 420 is typically indicated on a sticker located on the driver's side door jamb. This sticker provides the optimal tire pressure for both the front and rear tires. It is important to check and adjust the tire pressure regularly, as proper tire inflation ensures optimal performance, fuel efficiency, and tire longevity.
What type of coolant should I use for a Mercedes SL 420?
It is recommended to use a high-quality ethylene glycol-based coolant that is specifically formulated for use in Mercedes vehicles. The coolant should meet the specifications outlined in the owner's manual or the coolant reservoir cap. It is crucial to use the correct coolant to ensure proper engine cooling, prevent corrosion, and maintain the overall performance of the cooling system.
Get notified for new manuals?
We'll send you a quick email when a new Mercedes SL 420 manual is added.