I-DTEC engine was the first Diesel engine in the Honda stable to receive a DPF for the UK market. As part of this new change the selection of the correct grade and type of oil is very crucial. I-DTEC owners are instructed to ONLY use low SAPS (Sulphated Ash, Phosphorous and Sulphur) fully synthetic 0w-30 Engine oil that meet ACEA C2/C3 specification. It is so curial that owners are aware and can easily identify this unique oil from the mass of various specifications and vendors. Honda stance on this subject is as follows. With the continuing growth in Diesel registrations, the introduction of DPF's, low oil level sensors and variable servicing intervals the correct grade and specification of oil has become more important than ever. It is vitally important to use the correct ACEA specification of oil in cars equipped with DPF's as the use of the incorrect specification will result in the DPF becoming clogged with particles called SAPS (Sulphated Ash, Phosphorous and Sulphur), these particles cannot be broken down by the DPF resulting in it losing efficiency and eventually becoming blocked. Honda strongly recommends the use of of 0W/30 fully synthetic lubricants that meet ACEA C2/C3 specification Honda dealers stock SLX Professional Powerflow C3 which is DPF compliant oil , if you cannot get this oil or choose to use our own favourite oil company take care of the grade and type.