Question about 1993 Buick Park Avenue

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Oil pressure decreases significantly after 30 minutes of driving

When diving in the winter time I do notice a decrease in the oil pressure but when the weather gets warm, after I've drove for 30 minutes or more, there is a significant decrease in the oil pressure such that it flirts with the red zone.

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This indicates bearing wear or a plugged oil screen on the pump pickup. First have the actual oil pressure checked with a reliable mechanical gauge.
Oil pressure readings will change with ambient temps because the oil is cooled down while in the pan. As weather gets warmer, it does not cool as much so it gets a bit thinner and is able to go around worn bearings easier. A bearing job is expensive and requires engine removal to do it correctly.

Posted on May 23, 2009


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