why does my BMW X5 F15 (2014-2019) make a rattling noise on startup

Solution

1. Preparation

• Tools Required: Basic socket set, OBD-II scanner, mechanic's stethoscope, oil catch pan.
• Ensure the vehicle is parked on a level surface and the engine is turned off and cool.

2. Change Engine Oil and Filter

1. Drain Old Oil:
   • Place an oil catch pan under the oil pan.
   • Remove the oil drain plug using a socket wrench, allowing the oil to drain completely.
2. Replace Oil Filter:
   • Use an oil filter wrench to remove the old oil filter.
   • Apply a small amount of new oil to the rubber gasket of the new filter and install it.
3. Add New Oil:
   • Reinstall the drain plug and torque it to the manufacturer’s specification.
   • Pour the recommended amount and type of new engine oil into the engine.

3. Inspect and Replace Drive Belts

1. Remove Engine Covers:
   • If applicable, remove any plastic engine covers using a socket set.
2. Inspect Belts:
   • Check the drive belts for any signs of wear, fraying, or glazing.
3. Replace Belts:
   • If damaged, remove the tensioner using a socket wrench, then take off the old belt.
   • Install the new belt according to the routing diagram located under the hood.

4. Inspect Timing Chain/Belt

1. Access Timing Cover:
   • Remove any necessary components blocking access to the timing cover.
2. Check Chain/Belt Tension:
   • Inspect for proper tension and wear. If slack is observed, replacement may be necessary.
3. Replace If Needed:
   • Follow manufacturer instructions for timing chain/belt replacement, ensuring all timing marks align correctly.