ASUKI® CHALLENGE チャレンジ 10W40 is high-quality premium semi-synthetic engine oil for use in modern diesel and gasoline engines of passenger cars and light commercial vehicles which require “Low SAPS” type with limited levels of maintenance of sulfur, phosphorus and ash. The ASUKI® CHALLENGE チャレンジ 10W40 is fortified with ASUKI®’s signature NANO Technology, possessing a high viscosity index. ASUKI® CHALLENGE チャレンジ 10W40 maintains optimal engine cleanliness, effectively prevents formation of varnish, burnout and low-temperature deposits.