Image 1 of 1 STP Engine Flush (Petrol & Diesel) - 450ml £6.95 Quantity: Add To Cart Added! Suitable for petrol and diesel engines.Add directly to used motor oil before each oil change.Removes harmful sludge and deposits.Contains an anti-wear additive to help protect engine surfaces. Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More You Might Also Like LPG Fuel System Treatment - 1 Litre £11.90 Sold out BAR'S Radiator Stop Leak Compatible with all Anti-Freeze - 200ml from £7.95 SILVERHOOK Diesel Particular Filter Treatment Cleaner - DPF - 325ml (12 Pack) £79.95 SILVERHOOK Petrol Treatment & Injector Cleaner - 325ml from £4.59 SILVERHOOK Gold Edition Formula Diesel System Treatment - 325ml from £6.95