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Message: [QUOTE="Magnum PD, post: 1178068, member: 420"] Got this response from Mystic: Thank you for your inquiry Mr. Holsinger("Ford Freak")- assume you have a Ford PowerStroke F250 or F350? It appears you are describing what is called a HEUI(Hydraulic-electronic-unit-injector system) used in Caterpillar, Navistar engines and in Ford F250 or 350 trucks. 1. Mystik JT-8 SHD Synthetic Blend 15W-40 will provide excellent performance and viscosity retention under severe conditions. Engine oils can be impacted by the HEUI system in that the system tends to break down multi-grade oils over time which can result in poor operation if the viscosity is decreased significantly either due to fuel dilution or an oil not sustaining it's viscosity over time. 2. Viscosity retention and sustainability is very critical in HEUI systems in that the oil becomes the agent to allow fuel injectors to function efficiently in addition to lubricating the engine. Failure to maintain hydraulic pressures due to viscosity loss can result in poor operation which you may have encountered in the past, but there can be other causes of problems in this area so it may need further investigation if you in fact you have experienced problems? 2. If you are using Mystik JT-8 SHD 15W-40 you are also eligible for the Mystik LubeAlert Oil analysis program from which you can get direct insight into oil condition and viscosity readings. If you would like more information on this oil analysis program-respond back directly to the phone number enclosed below and we will discuss how this program works. [/QUOTE]

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