AMSOIL OE 15W-40 Synthetic Diesel Oil is a low-sulfated ash formation that meets the requirements for low-emission quality diesel oil, while offering protection under the most severe operating conditions. It is compatible with all exhaust treatment devices and is designed for engines equipped with diesel particulate filters (DPF). OE Diesel Oil also provides extreme temperature performance. It is formulated for improved heat and oxidation resistance over conventional oil. AMSOIL OE 15W-40 Synthetic Diesel Oil features a low volatility (burn-off) rate, resulting in reduced oil consumption and emissions during operation.