AMSOIL has discontinued the 15W-40 Synthetic Blend Diesel Engine Oil (product code: PCO). “PCO” became redundant earlier this year when the OE 15W-40 Synthetic Diesel Engine Oil was introduced. AMSOIL OE 15W-40 is value-priced and meets the latest API CJ-4 specification, making it suitable for late model and as well as older diesel applications. Remaining stocks of the Synthetic Blend 15W-40 will be available at a reduced price. Feel free to contact us for more information.