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Not intended for newer vehicles. This is only occasional and should not be overdone. Only for old vehicles without egr, dpf, catalytic converters, etc. 3-4 times a year, occasional lubrication of the pump is used. There is no noticeable difference in terms of quieter operation, etc. Overdoing it can be harmful. In the past, heating oil and diesel D1 and D2 were used in the vehicle. NOT INTENDED FOR NEWER VEHICLES AND COMMON RAIL ENGINES.