Porsche 718 Carbon Cleaning Malaysia
718 2.0L and 2.5L: direct injection — no port injection to clean valves. Carbon on intake valves at 60,000–80,000 km: rough cold idle, hesitation, reduced power. Walnut blast: 4-cylinder smaller intake, RM 900–1,400. GT4 4.0L NA flat-six: port injection — no carbon concern. GTS 4.0L also port-injected: no walnut blast needed.