2026-07-22 · 5 min read
Mercedes-Benz CLA Carbon Buildup — GDI Intake Cleaning Malaysia
CLA direct injection engines (M270/M274/M260) develop intake valve carbon at 50,000+ km. Walnut blasting or chemical induction service recommended. Symptoms and costs in Malaysia.
Identical to A-Class carbon buildup: GDI engine deposits on intake valves, visible by 60,000–80,000 km. Walnut shell blasting recommended; in-tank additives do not reach the valves and are not effective. Cleaning cost: RM 800–1,200.
Carbon Buildup — Mercedes Direct Injection
Mercedes-Benz M270, M274, M276, and M177 engines use direct injection — intake valve carbon buildup is a known issue, especially in vehicles used predominantly for short urban trips in KL/PJ. Every 3–6 months, take a 30-minute highway run at 3,500+ rpm to burn off soft deposits. An intake carbon cleaning service (walnut blasting or chemical) costs RM 500–1,000 at a specialist workshop and is recommended every 50,000–80,000 km. Signs of significant buildup: rough idle, cold-start misfires, reduced power.