Question about 1999 Dodge Dakota

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99 dodge dakota. Oil pressure moves between 40 & 80.

Could the sending unit be causing the problem. When I start up the oil pressure is up to around 80. As I drive it will fall to below 40 and then move back up to 80 again. The oil is full and it will do it with new oil and old oil.

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  • holtt6886 Jan 15, 2009

    I guess I mistated my problem. The oil pressure will move from about 80 to below 40 while maintaining the same speed. If I increase the rpms, the pressure does not go up. After a while it will move back up while maintaining the same speed and them fall back below 40. It doesn't matter if the oil is hot or cold.



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Believe it or not....this is actually normal depending on which oil that you use. Some of the thinner oils will cause this to jump around and the thicker oils will make it jump around less. When you first start the truck the oil is thicker and will read a high psi then get lower with less rpm while the oil warms and then gets thinner then builds pressure again with more volume being put through the engine while you drive down the road hence going back up to 80 psi. This is typical winter issue with the Dakota's in general. I would only be concerned if the pressure bottoms out while driving or starting.

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Posted on Jan 15, 2009

  • Jeremiah Meyer
    Jeremiah Meyer Jan 15, 2009

    Sounds like a sending unit to me......Also could be your sensor going out as well...that makes more sense thanks for the clarification. Good luck to you.





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