Tools and Materials You'll Need:
* New oil: Check your owner's manual for the correct type and quantity (typically around 7-8 quarts of 0W-40 or 5W-40 synthetic).
* New oil filter: Again, consult your manual for the correct part number. Mercedes-Benz filters are often more expensive than generic ones, but using the wrong filter can cause issues.
* Oil filter wrench: The E320 usually has a cartridge-style filter, requiring a specific wrench (often a cap-type or strap wrench).
* Wrench for drain plug: This is typically a 14mm or 17mm socket. Double-check your manual.
* Drain pan: A large enough capacity to hold the used oil.
* Funnel: To pour the new oil into the engine.
* Jack and jack stands: Crucial for safety. Never work under a car supported only by a jack.
* Wheel chocks: To prevent the car from rolling.
* Torque wrench: Essential for tightening the drain plug to the correct specification.
* Gloves: To protect your hands.
* Rags or shop towels: To clean up spills.
* Optional: Used oil disposal container (check local regulations).
Procedure:
1. Preparation: Warm up the engine for 5-10 minutes to thin the oil. This makes draining easier. Then turn off the engine and let it sit for a few minutes to allow the oil to settle.
2. Safety First: Engage the parking brake firmly. Securely jack up the car and place it on jack stands under the designated jack points (consult your owner's manual). Use wheel chocks on the wheels that are still on the ground.
3. Locate the Oil Drain Plug: This is typically located on the bottom of the oil pan.
4. Drain the Oil: Position the drain pan under the drain plug. Carefully loosen and remove the drain plug using the correct wrench. Let the oil drain completely – this can take 15-20 minutes.
5. Locate and Replace the Oil Filter: The oil filter is usually located on the side of the engine. Use the correct oil filter wrench to remove the old filter. Before installing the new filter, lubricate the rubber gasket on the new filter with a bit of fresh oil. Tighten the new filter by hand – don't over-tighten.
6. Replace the Drain Plug: Once the oil has drained, clean the drain plug and replace it, tightening it to the correct torque specification using a torque wrench. Over-tightening can strip the threads.
7. Lower the Car: Carefully lower the car from the jack stands.
8. Add New Oil: Using a funnel, pour the correct amount of new oil into the engine (refer to your owner's manual).
9. Check the Oil Level: Use the dipstick to check the oil level. Add more oil if needed, until it reaches the "full" mark.
10. Run the Engine: Run the engine for a few minutes. Check for leaks around the drain plug and oil filter.
11. Recheck the Oil Level: After running the engine, turn it off and let it sit for a few minutes. Recheck the oil level and add more if necessary.
12. Dispose of Used Oil Properly: Take the used oil to a recycling center or auto parts store that accepts used oil.
Important Notes:
* Consult your owner's manual: This is the most important step. Your manual will have specific instructions and torque specifications for your 1999 E320.
* Safety first: Working under a car is dangerous. Always use jack stands and follow safety precautions.
* Proper disposal: Dispose of used oil and filter responsibly.
* Torque Wrench: Using a torque wrench is critical to prevent damage.
This guide is for informational purposes only. If you are not comfortable performing this task, it's best to take your car to a qualified mechanic. Improperly performed oil changes can lead to serious engine damage.
