Overview
Community orientation
The G29 Z4 roadster with the B48 four (sDrive20i/30i) and B58 six (M40i), rear-wheel drive, ZF 8-speed automatic (a manual was later offered on the M40i in some markets). Editorial summary, not a reliability rating; facts and evidence below.
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Filtered: B48 · 2.0L petrol (B48).
Known issues
Sorted by severity. Tap an issue to reveal its symptom, repair and what to check.
Engines & reliability
Tap a row to filter the issues to that engine.
Pre-purchase checklist
Test drive
- ☐Assess shift quality and D/R engagement when warm
Maintenance
Key service intervals — vary by engine and driving conditions.
ItemIntervalCost
Brake fluid~2 years
Engine oil and filter12,000–15,000 km