Engine cleaning: oil residue or fuel residue – which is harder to remove?

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Fuel systems and engine oil often produce dirt, which affects vehicle performance. But which type is harder to clean? Let’s find out with Madin right away!  1. Fuel residue – fast formation, easy to clean Fuel residue occurs when unburned hydrocarbons adhere to the engine surface. Under high temperatures, they burn and become harder over […]