Rotella T1 40 (CFSL) motor oil heavy duty Diesel engine oils use well proven performance additives to fight engine wear and prevent deposits, providing reliable lubrication and consistent performance. Suitable for day to day use in turbo and non-turbocharged older engines. Rotella T1 provides excellent wear protection that promotes engine durability. T1 is suitable for mixed fleets combining large over the road Diesel trucks with smaller Diesel and gasoline-fuelled light trucks and passenger cars. T1 is suitable for heavy equipment used for construction, mining or quarry operations.