why does the oil pressure drop in my 2004 suburban when i drive more than 40 miles
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Darron
Mechanic since 1991!
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-A drop of about 10% to 40% is natural as the oil warms up, depending upon the engine and how cold it was when you started it. As long as you have at roughly 10 psi for every 1000 RPM, or more, you are fine.
-If you fall below that ratio, see if the oil is overfilled. If so it could get foamy and cause a low pressure condition.
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