MG N-series (13S4C / 15S4C)

MG's own petrol fours under SAIC — the 1.3 13S4C, 1.5 15S4C and turbocharged 15C4E and 20L4E — in the MG3, MG5, MG6 and HS.

⚑ They are not Rover K-Series engines, which is the distinction worth establishing: MG's older cars carry the K-Series and its notorious head gasket, and that page's warnings do not apply here. SAIC's engines are a clean-sheet design from the 2010s.

The VTi-Tech badge covers several of them and predicts nothing about which — this catalogue refuses it as a designation for that reason.

They are conventional modern fours: chain-driven, port-injected on the naturally aspirated versions and direct-injected on the turbos. On the turbos intake-valve carbon at mileage is expected, and the turbocharger's oil feed is what the service interval protects.

English-language documentation is thin outside the UK, where MG sells in volume — which is unusual for a Chinese-built engine and makes the UK material worth finding.