Checking the oil level in a manual transmission (BMW 3 Series E46)

Visual inspection of gearbox tightness

Gearbox oil leaks may occur in the following places:

• At the junction of the drive shaft to the gearbox.
• Near the oil drain plug.
• Near the oil filler cap.

To locate the oil leak, follow these steps:

• Clean the gearbox housing.
• Cover possible leaks with a thin layer of chalk or talc.
• Take a test drive of about 30 kilometers.
• Raise the car on a lift or over an inspection pit and determine the location of the oil leak based on the oil leaks.

Fix the leak and fill the gearbox with oil.

The oil in the manual transmission does not need to be changed.

1. There is a filler/oil level plug on the transmission that must be removed to check the oil level. If the vehicle is raised to allow access to this plug, make sure it is securely supported - do not crawl under a vehicle that is supported only by a jack!

2. Use a socket wrench to loosen the threaded plug of the oil filler hole.

3. Place the vehicle on the lift in a horizontal position.



4. Unscrew the oil filler plug from the gearbox, which is located on the side surface of the gearbox.

5. Check the oil level. The oil level should be at the lower edge of the threaded hole. If necessary, add oil through the oil filler hole. The oil type is specified in the Section "Types of Lubricants and Fluids Used" of the Specifications.



6. Screw in the oil filler plug and tighten it to a torque of 50 N·m

The gearbox housing can be made of aluminum or magnesium alloy. If a new oil filler plug is installed, it must be matched to the corresponding gearbox by number, as the plugs have different coatings. If the wrong plug is used, contact corrosion may occur.

8. After a few kilometers, check for fluid leaks.

9. If you notice that your transmission requires frequent topping up, this may simply be due to leaks that need to be identified and fixed before serious problems arise.

(Information taken from this resource: BMWman.ru)