Utilizing the filter original designed for HKS Oil Filter and increasing its filter surface area by 15%, compared with a conventional product, greatly iUtilizing the filter original designed for HKS Oil Filter and increasing its filter surface area by 15%, compared with a conventional product, greatly improved particle collection performance. HKS Oil Filter's minimum particle size is 20? compared with 25? of JIS standard which corresponds to the filtration performance requirement of most engines. It is recommended to replace a filter every 10,000 km or 6 months under the normal driving environment. For sports and/or race use, it is recommend to replace a filterevery 3,000 km - 5,000km. ?65 x H50 is newly released. This new size filter is available for the latest Kei cars and vehicle equipped with an oil cooler that needs a low height filter. (A sandwich type attachment is required to install HKS Oil Filter.) HKS Oil Filter's minimum particle size is 20? compared with 25? of JIS standard which corresponds to the filtration performance requirement of most engines. It is recommended to replace a filter every 10,000 km or 6 months under the normal driving environment. For sports and/or race use, it is recommend to replace a filterevery 3,000 km - 5,000km. ?65 x H50 is newly released. This new size filter is available for the latest Kei cars and vehicle equipped with an oil cooler that needs a low height filter. (A sandwich type attachment is required to install HKS Oil Filter.)