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Oil Pressure on 455 Jumps After Oil Change

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Old November 3rd, 2016, 06:09 AM
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1969 Oldsmobile Cutlass S
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Oil Pressure on 455 Jumps After Oil Change
So recently did a oil change from full synthetic 10w-40 to non synthetic 10w-30. Before the oil change I got around 23-24 oil pressure at idle. Now I have around 42-43 at idle. I know these old 455's usually idle around 20-25 so should I be worried if I'm now getting 40 after a change? In the upper RPM's I get around 60.
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Old November 3rd, 2016, 06:53 AM
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Is this at operating temp?
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Old November 3rd, 2016, 06:58 AM
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Synthetics tend to flow a bit better than dino. Also if you changed brands of oil filter this can happen. I would not be concerned.
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