Mercedes S320 Workshop Manuals and Repair Manuals

To change a flat tire on your Mercedes S320, first, locate the spare tire, jack, and lug wrench in the trunk. Loosen the lug nuts slightly before raising the vehicle with the jack. Completely remove the lug nuts, then remove the flat tire and replace it with the spare tire. Tighten the lug nuts in a crisscross pattern, lower the vehicle, and finally, tighten the lug nuts again. Always refer to the owner's manual for detailed instructions.

To change the windshield wiper blades on your Mercedes S320, lift the wiper arm away from the windshield and locate the release tab or button on the blade assembly. Press or slide the release mechanism to remove the old blade. Align the new blade with the wiper arm and push until it clicks into place. Gently lower the wiper arm back onto the windshield. It is recommended to replace the wiper blades at least once a year or when they show signs of deterioration for optimal visibility during rainy conditions.

To check the coolant level in your Mercedes S320, ensure the engine is cool. Locate the coolant reservoir, usually a translucent plastic tank with minimum and maximum indicators. The coolant level should be between these marks. If the level is low, add a mixture of coolant and distilled water to the reservoir, ensuring it is the correct coolant type recommended for your vehicle. Proper coolant level and quality are essential for engine cooling and preventing overheating.

To check the tire pressure on your Mercedes S320, first, ensure the tires are cold. Locate the recommended tire pressure values, usually found on a sticker inside the driver's door jamb or in the owner's manual. Use a tire pressure gauge to measure the pressure of each tire and adjust if necessary. Proper tire pressure ensures safety, optimal handling, and prolongs tire life.

To program a new key fob for your Mercedes S320, first, insert the existing key into the ignition and turn it to the "on" position. Within 10 seconds, remove the key and insert the new key fob. Within 30 seconds, press any button on the new key fob once. The programming is complete when the central locking system locks and unlocks automatically. Repeat the process for additional key fobs. If you encounter any issues, consult the owner's manual or contact a Mercedes dealership for assistance.

To reset the maintenance light on your Mercedes S320, turn the ignition key to the "on" position without starting the engine. Press the left or right arrow buttons on the steering wheel until the "Service A/B due" message appears. Press and hold the OK button for approximately 3 seconds until the reset confirmation appears on the instrument cluster. Release the button and turn off the ignition. The maintenance light should now be reset.

It is recommended to change the oil in your Mercedes S320 every 10,000 miles or once a year, whichever comes first. Regular oil changes are crucial to maintain the engine's performance and longevity. Neglecting to change the oil on time can result in increased engine wear and reduced fuel efficiency.

The coolant in your Mercedes S320 should be flushed and replaced every 5 years or 100,000 miles, whichever comes first. Over time, coolant can degrade, lose its effectiveness, and accumulate contaminants that can harm the cooling system. Flushing the coolant and replacing it with a fresh mixture ensures proper engine cooling, prevents corrosion, and maintains the longevity of cooling system components. Always use the coolant type recommended by the manufacturer and follow the specified intervals for coolant maintenance.

The air filter should be replaced every 20,000 to 30,000 miles or every 2 years for optimal engine performance and fuel efficiency. A clogged air filter restricts airflow to the engine, reducing power output and potentially causing damage. Regularly inspect the air filter and replace it if it appears dirty or damaged.

The brake pads should be inspected every 10,000 to 15,000 miles, and typically need replacement around 30,000 to 70,000 miles, depending on driving habits and conditions. However, it is essential to monitor the brake pad thickness regularly and have them replaced when they reach the wear indicator or become too thin. Delaying brake pad replacement can lead to reduced braking performance and potential damage to other brake system components.

The cabin air filter should be replaced every 15,000 to 30,000 miles or every 1 to 2 years, depending on driving conditions and air quality. A dirty or clogged cabin air filter can reduce the effectiveness of the HVAC system, decrease airflow, and lead to unpleasant odors inside the vehicle. Regular replacement ensures clean and fresh air circulation in the cabin.

The fuel filter on your Mercedes S320 should be replaced every 60,000 to 90,000 miles or as recommended by the manufacturer. A clogged fuel filter can restrict fuel flow, leading to reduced engine performance and potential damage to fuel injectors or other components. Regular replacement of the fuel filter helps ensure proper fuel delivery and prolongs the life of the fuel system.

The serpentine belt should be inspected every 30,000 miles and usually needs replacement around 60,000 to 100,000 miles. However, it is crucial to visually inspect the belt for signs of wear, such as cracks, fraying, or stretching, and have it replaced if any issues are found. A worn or damaged serpentine belt can cause engine accessories to malfunction and potentially lead to engine damage. Regular maintenance and belt replacement will help ensure reliable operation of your Mercedes S320.

The spark plugs on your Mercedes S320 should be replaced every 60,000 to 100,000 miles, or as recommended in the owner's manual. Worn or fouled spark plugs can lead to misfires, decreased fuel efficiency, and reduced engine performance. Regularly inspect the spark plugs for signs of wear, such as eroded electrodes or excessive carbon buildup, and replace them if necessary.

It is recommended to use a synthetic oil with a viscosity of 0W-40 or 5W-40 for your Mercedes S320. Synthetic oils provide better protection and performance compared to conventional oils, especially in extreme temperatures and demanding driving conditions. Always refer to your owner's manual for specific oil recommendations.