Engine Platform
M139.
The M139 powers the W177 A45 S, C118 CLA45 S and X247 GLA45 S. Hand-built in Affalterbach, twin-scroll turbo, electric wastegate, and a 421hp stock figure that comes in at the highest specific output of any production 4-cylinder ever made.
- Hand-built in Affalterbach — one engine, one engineer
- Highest specific output of any production 4-pot
- Twin-scroll electric-wastegate turbo
- Forged internals, dry-sump-style oiling
Upgrade Pathway
- 01Closed-airbox M139-specific intake
- 02Catless downpipe + AMG-style high-flow cat-back
- 03Upgraded intercooler — Australian-summer heat tolerance
- 04Alloy charge pipe upgrade
- 05Oil cooler + auxiliary cooling pass
- 06Hybrid turbo hardware for 600hp+ pathways
Chassis On This Platform
Build Pathway
Catalogue · M139
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M139 · Platform Notes
- What is the M139 known for?
- Hand-built in Affalterbach — one engine, one engineer. Highest specific output of any production 4-pot. Twin-scroll electric-wastegate turbo. Forged internals, dry-sump-style oiling.
- What is the recommended upgrade path for the M139?
- A typical M139 build progresses through: Closed-airbox M139-specific intake; Catless downpipe + AMG-style high-flow cat-back; Upgraded intercooler — Australian-summer heat tolerance; Alloy charge pipe upgrade; Oil cooler + auxiliary cooling pass; Hybrid turbo hardware for 600hp+ pathways.