2016 BMW 340i (B58) — Should You Buy One?
Typical asking price: $20,000–$30,000. This is one of the more reliable vehicles in its class — here's what to watch for anyway.
Kestrel Take
The B58 inline-six is the engine that restored BMW's reputation — closed-deck block, robust chain, and a reputation for taking abuse. This is the modern BMW to buy used. The failure points that remain are gaskets and cooling components, not catastrophes.
What we checked
Checked against public records, 2026-09-25
We checked NHTSA for this exact year and model and it returned nothing. That is a fact about the database, not a clean bill of health — it usually means few of these were sold or few owners filed. What follows is our own write-up, unreconciled.
Known Issues for the 2016 BMW 340i (B58)
Ranked by wallet impact. These are documented, recurring problems — not freak accidents. How we decide that.
The recurring BMW oil leak. Oil onto the belt and the front of the engine. Routine at 70k-100k miles.
Repair cost (estimate): $700-$1,400
Source: not yet checked against public records.
Fails without warning and the car overheats fast. Preventive replacement around 90k miles is the norm.
Repair cost (estimate): $900-$1,600
Source: not yet checked against public records.
Standard German-car gasket aging. Not urgent, but it adds up.
Repair cost (estimate): $500-$1,200
Source: not yet checked against public records.
The plastic charge pipe splits under elevated boost. Cheap to fix, and a reliable indicator that the car has been tuned.
Repair cost (estimate): $300-$600
Source: not yet checked against public records.
Walk-Away Red Flags
- ✗Evidence of a tune — check for a JB4 or a flashed DME
- ✗Oil leaks left unaddressed
- ✗Overheating history
- ✗Run-flat tires replaced with mismatched brands
Good Signs
- ✓Stock tune with a BMW dealer or specialist service history
- ✓Water pump and oil filter housing gasket already done
- ✓M Sport suspension without a coilover conversion
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Known issues on this page are based on documented owner reports, NHTSA complaints, class-action records, and manufacturer technical service bulletins. Individual vehicles vary. A pre-purchase inspection by a trusted mechanic is always worth doing.
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