description primary oil conforming to relevant is specification for the following products superior kerosene oil sko non pds as per is specification is 1459 2018 fourth revision or latest warranty perio d 30 months after the date of delivery description primary oil conforming to relevant is specification for the following products superior kerosene oil sko non pds as per is specification is 1459 2018 fourth revision or latest warranty perio d 30 months after the date of delivery