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DPF stands for Diesel Particulate Filter (sometimes called CPF - Catalysed Particulate Filter). These are filters in the exhaust line of many post-2006 diesel vehicles which trap tiny particles in the exhaust gases resulting in cleaner exhaust emissions. Most vehicles with a DPF need a low SAPS oil to prevent premature blockage of the DPF. Replacement/manual regeneration of the prematurely blocked DPF has been known to be a very costly enterprise, so the correct engine oil must be used at all times.