Here's another additive https://www.halfords.com/motoring/engine-oils-and-fluids/fuel-and-oil-additives/millers-petrol-power-ecomax-500ml-166788.html
Dosage Ratio 1 Part To 1000 Parts [1 ml/L]
Sooo… chuck half a bottle in.
@pdlouche started
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Here's another additive https://www.halfords.com/motoring/engine-oils-and-fluids/fuel-and-oil-additives/millers-petrol-power-ecomax-500ml-166788.html