2018 Denali xl oil gauge drops from 40 to 20 when it is idling.

Asked by Sep 06, 2019 at 01:55 PM about the 2018 GMC Yukon XL Denali 4WD

Question type: Maintenance & Repair

When u apply gas the gauge goes back to 40

1 Answer

70,755

First, check to see that the oil level is correct; low level will do this. Otherwise it's most likely the oil pump and/or pressure relief valve, or could be worn-out crankshaft and bearings. The oil pump runs at a fixed pressure and the relief valve opens to reduce it to operating pressure, then the bearings create pressure resistance. The Oil light is just alerting you that you have something seriously out of acceptable operating range. A more remote possibility is that the oil sending unit is bad.

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