02 chevyHD 4wdwhat does it mean if oil presure goes up while driving?

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It is suppose to go up. As engine RPM increases, so does the amount of "preasure" or flow of oil . Each engine/manufacturer has "limits" on the amount of preasure that any given engine can tolerate. If oil preasure "exceeds" these limits, it can lead to faliures within your engine....ie: blown gaskets, seals etc. If you are using a "thicker" viscosisty oil, this will also increase your oil preasure, especially during "colder" weather. Check with a dealer, they should be able to tell you what your perimiters should be for your oil preasure....low/high readings.
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