Diesel particulate filters (DPF) require routine cleaning to remove ash that builds up over time. Most vehicles using a DPF system will have an on-board filter service monitor to indicate the filter condition and guide your filter cleaning schedule.
In ancient times the islands formed an independent kingdom. Chinese and Japanese sovereignty were successively forced on the archipelago from the 14th to the 19th century, and in 1879 the Ryukyus became an integral part of Japan. After the defeat of Japan (1945) in World War II, the United States took control of the islands.
In an agreement with the Vichy government in France in August 1940, Japan formally recognized French sovereignty in Indochina in return for access to military facilities, transit rights, and the right to station occupation troops in Tonkin. On 30 August 1940, Japan began to occupy a transit base at Haipbong and all major airfields of Tonkin.