Home Repair and Service Manual Engine Oil Service – BMW B46/B48 Turbo 4-Cylinder Engine

Engine Oil Service – BMW B46/B48 Turbo 4-Cylinder Engine

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Engine Oil Service – BMW B46/B48 Turbo 4-Cylinder Engine

This article gives step by step instructions on replacing the engine oil and filter in all BMWs with the B46/B48 four cylinder engine.
Not sure which engine you have in your BMW? Use our engine finder tool to easily identify it!
Possible Symptoms: Not applicable for this repair.
This repair can be used on the following BMW models:
Intermediate level repair.

Step 1 - Purchase Parts

You will need the following parts and supplies to perform this repair.

BMW TwinPower Turbo Engine Oil

The debate over which brand of oil is best for your BMW is worse than politics these days. All we can say is in our opinion, the best engine oil is factory engine oil. Genuine BMW TwinPower oil is the same engine lubricant that your BMW was shipped from the factory with.

Oil Filter - Genuine BMW

If in doubt as to which brand of oil filter to use, we suggest going with a Genuine BMW one. This is the same factory filter that would be installed at the BMW dealership.

Step 2 - Repair Procedure

Unless otherwise noted, all vehicle repair step images in this article are copyrighted, and used courtesy of BMW of North America, Inc. .
1. replacing the engine oil and filter
B46 acoustical engine cover
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- Remove the acoustic cover by pulling up until it releases from its rubber grommets.

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B46 engine oil filter cover
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- Remove the oil filter cover (1)

unclip the positive battery cable and remove the sealing gasket
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- Detach the positive battery cable (1) and the sealing gasket (2) so the oil filter can be accessed.

remove the oil filter with a 27mm oil filter socket
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- Using a 27mm oil filter socket removal tool, remove the oil filter cover.

- If you need a oil filter removal tool, please see our parts list above to order one.

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remove the oil filler cap
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- Remove the oil filler cap. The oil will not properly drain out of the engine unless the cap is removed!

open the access hatch under the vehicle
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- Moving underneath the vehicle, open the access hatch (2) by turning the thumb release (1). the oil drain plug is inside the access hatch.

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remove the oil drain plug
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- Remove the oil drain plug (1). Allow the oil to thoroughly drain out.

- Replace the oil drain plug using a new sealing washer. Torque the drain plug to 25 Nm (18 ft-lb).

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install a new oil filter element and o-rings
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- Install a new oil filter element (2) into the oil filter cap. Make sure to replace the sealing o-rings (1) and (3) when installing a new oil filter.

- Apply a light coating of engine oil to the sealing o-ring (1).

- Insert the oil filter back into the engine and hand tighten. Torque the oil filter cap to 25 Nm (18 ft-lb).

View part diagram for this step
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