2026-07-22 · 5 min read
Mercedes GLC Coupe Engine Oil Guide — MB 229.51 / 229.6
C253 GLC Coupe M274 uses MB 229.51 (5W-30 or 0W-30). C254 M254 uses MB 229.6 (0W-20). Never use generic 5W-40 — these engines require low-viscosity fully synthetic oil for the variable valve timing system.
GLC Coupe Engine Oil — C253 vs C254
C253 M274 2.0T uses MB 229.51 (5W-30 or 0W-30, 6.0L). C254 M254 2.0T uses MB 229.6 (0W-20). Do not use 5W-40 — variable valve timing requires low-viscosity oil for correct solenoid response.
Mercedes Engine Oil Grade — Malaysia
Mercedes-Benz engines require MB 229.51 (5W-30 fully synthetic) for petrol engines on modern models — do not substitute with non-MB-spec oil. The M271 1.8T W204 uses MB 229.3 (5W-40). G-Class 4.0L V8 biturbo requires 0W-40 MB 229.5 or 229.51. Using non-spec oil shortens the timing chain tensioner life and may void warranty claims. Change every 10,000–15,000 km per ASSYST — but in Malaysian city conditions, 10,000 km is the recommended maximum.