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BMW 8 Series G15 840i B58 Carbon Intake Valve Build-Up — BMW 2018 | MyCarFault

BMW 8 Series G15 840i B58 Carbon Intake Valve Build-Up

BMW 2018 B58 3.0 Turbo

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⚡ Quick Summary

Severity Level

Low

Safe to Drive?

✅ Safe to Drive

Safety Impact

No direct safety impact reported by owners

Urgency Level

🟢 Low Priority

The B58 direct injection in 8 Series G15 840i accumulates carbon on intake valves above 80,000 miles. Walnut blasting costs £350-600.

Onarım / Çözüm

No confirmed fixes yet. Share yours below.

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No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this BMW 2018 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.

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