BMW X3 Exhaust System: Specs, Fitment & Common Faults
A genuinely honest finding: on short journeys, extra fuel injected to trigger a DPF regen can simply stay in the engine rather than burning off, diluting the oil — one documented case found the oil level sitting right at the maximum mark as a direct result.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 247-037 / Walker 05924
| Rear silencer (back box) — aftermarket | Walker 05924 (1170 mm); Bosal 247-037, 247-981, 247-413; MTS 01.60519; Ernst 251006; Polmo 03.28, 03.07; Vegaz BS-451, BS-223EBER (990 mm), BS-83 |
|---|---|
| Centre / intermediate silencer — aftermarket | Vegaz BS-136, BS-140, BS-134, BS-294IMA, BS-295; Polmo 03.51, 03.63; Ernst 275002, 275040; 4MAX 0219-01-00318P; No Bosal, Walker or MTS. |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 090-261 (Euro 6); Walker 28114 (660 mm, code 92), 28071 (820 mm, code 92); Vegaz BK-304, BK-896 (Euro 6), BK-875 (Euro 5); JMJ 1279 (SCR, Euro 5/6), 1080244 (M47N2, old diesel); BM Catalysts BM80487H; NAP CAK11649 / AS 45310 (560 mm, Euro 6) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Not engine-specific. |
BMW X3 Exhaust System: The Part That Announces Its Own Problems
Where a lot of BMW X3 parts fail silently until you spot something visually wrong, this one tends to make noise first — a rattle, a drone, an audible change that wasn't there recently. That's a useful early-warning system if you're paying attention.
BMW X3 Exhaust System: What It Does
Away from the engine, through the silencer, and often through a catalytic converter and particulate filter before reaching the tailpipe — that's the BMW X3's exhaust job in three steps. Petrol and diesel versions frequently need different systems entirely, since their emissions treatment isn't the same.
BMW X3 Exhaust System: Watch: Replacing It
Weak: BMW muffler replacement, X3/F25 not confirmed from title. Alt: https://www.youtube.com/watch?v=FdHj20ILVjE (quad exhaust kit install for X3/F25, tips only).
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A Genuinely Honest, Real Finding Worth Knowing — BMW X3 Exhaust System
If you regularly drive mostly short journeys, this is genuinely worth knowing: on shorter trips specifically, extra fuel that the car injects in an attempt to raise the exhaust temperature enough to trigger a proper regeneration can sometimes simply stay in the engine rather than actually burning off and completing the cycle, diluting the engine oil as a result. One documented case found the oil level sitting right at the maximum mark as a direct consequence of this happening repeatedly — worth checking your oil level specifically if you suspect this is occurring, and worth mentioning this pattern directly if a warning light appears alongside an unusually high oil level.
It's also genuinely worth knowing that if your regular driving is mostly short journeys, giving the car a proper, sustained run at higher revs for around 20 to 30 minutes every six to eight weeks can help ensure the DPF gets a genuine opportunity to regenerate fully.
BMW X3 Exhaust System: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Exhaust System Guide for warning signs and fault codes to watch for, confirming fitment against your VIN, and which aftermarket brands are worth trusting.
More BMW Exhaust System
The same part, covered across other BMW models.