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What Causes Spikes in Oil Pressure?
Why do we see spikes in the automotive gasoline engine lubrication oil pressure during cold weather?
-- Abhi Gul, Troy, MI
If referring to the initial oil pressure at start-up, this is because the oil has thickened overnight, and pressure will likely not be in steady until the oil reaches normal operating temperature. Synthetic oils, which have a better response to both low and high temperatures, will generally provide a more consistent oil pressure more quickly than conventional oils.