New Cure Engine Breathing in 8 hours All You Need Is Ametech Engine Oil 3x400mls

Use 400ml for each 2 litres of engine capacity or 10% by oil substitution. Car is very lumpy to drive, no power at the top end. They say Flush the engine, fit a new filter, and add new oil (with no additives i.e stop smoke, slick 50 etc).