NOVICE WORKSHOP JOURNEY · EVIDENCE LINKED
Complete N43 minor service
BMW 3 Series Touring · E91 LCI · 320i · N43B20 · Manual
A novice-oriented, evidence-linked engine-oil and filter journey for the BMW E91 LCI 320i with N43B20, from vehicle confirmation and safe access through leak checks, electronic level validation, CBS handling, disposal and service history.
14/14 steps released · about 150 minutes for a prepared first-time owner · stop gates remain mandatory.
- Identify an exact-vehicle oil approval instead of choosing oil by viscosity alone.
- Use a torque wrench correctly and understand why a click is a stop signal, not a target to repeat.
- Recognise the N43 cartridge filter, its three replaceable O-rings and the drain-plug sealing ring.
- Raise and support a vehicle only with verified lifting points and rated equipment.
- Validate an oil service with an electronic level reading, a two-stage leak inspection and a durable service record.
BMW’s wider minor-service scope also includes the microfilter, a parking-brake check and third-oil-change decisions. The E91 cabin-microfilter journey is already available; brake, air-filter and spark-plug work stay separate until their own exact procedures are released.
FASTENERS & TIGHTENING
Check the hardware before you start
No separate verified fastener map is published for this guide. This does not mean no fasteners are involved. Follow the released steps and their cited specifications; if a required tightening or replacement rule is missing, stop and verify it.
How WrenchGuide treats fastener information
Material, reuse policy and tightening method are separate facts. Torque plus angle alone does not establish that a fastener is torque-to-yield or single-use. WrenchGuide will not invent a torque value or replacement rule.
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MY WORKSHOP JOURNAL
Remember how your car came apart.
Attach private notes and your own teardown photos to the exact procedure step. They stay on this device in the current local-first beta.
Confirm the car and decide what this service includes
Take a quick photo before disconnecting or removing something you may need to identify during reassembly.