ELF PERFORMANCE PRO 1000 15W-40 is developed for the newest North American on-road diesel engines and suitable for existing diesel engines due to its backwards compatibility down to CJ-4. With its low-SAPS" (low sulphated ash, phosphorus and sulphur) technology, ELF PERFORMANCE PRO 1000 15W-40 protects engines equipped with any kind of post-treatment systems, such as diesel particulate filters (DPFs). ELF PERFORMANCE PRO 1000 15W-40 enables coverage of a fleet of mixed brands, with a minimal number of products."