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Opie Oils stocks a wide range of car additives and flushes designed to maintain performance, improve efficiency, and support long-term engine health. From fuel system cleaners and injector treatments to oil flushes and cooling system additives, our range covers key maintenance products for petrol and diesel vehicles. Browse the full range below, with free UK delivery on orders over £80. Read our complete guide to car additives for guidance on what product does what job!
Please note that fuel treatments cannot currently be shipped outside the UK.
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Vehicle additives and flushes are designed to clean and protect different areas of your car’s engine and fuel system. Over time, deposits, carbon build-up and contaminants can affect performance and increase wear. Using the right treatment helps restore cleaner operation and supports smoother running.
Modern flushes are not like the aggressive older type ones that used solvents. The newer ones use detergents, antioxidants and pH neutralisers to clean the engine, while also improving the quality of any oil that doesn’t drain out.
Need an additive for diesel cars? We stock a variety of diesel additives and cetane boosters, along with DPF and EGR cleaners to help maintain emissions systems and reduce blockages. Petrol drivers can benefit from octane boosters and fuel additives, designed to enhance performance and support smoother engine response.
If you need help choosing the right additives for your vehicle, feel free to contact us — we’re happy to help. We can advise you on other automotive oils and fluids too, from engine oil to gearbox oil.
Browse car flushes and additives at Opie Oils today and help keep your vehicle running cleanly, efficiently, and reliably, with no-leak guarantee on every order.