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.