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regardless of what brad says, that oil pressure releif spring / piston combo varies oil pressure with temperature. FYI, over time, springs sag. their spring RATES don't change, but their length WILL change. if this thing gets shorter, it bleeds off oil pressure.
if you're concerned about oil pressures, swap it out. it takes a couple of minutes during an oil change and costs less than $20. it improved my oil pressure at idle by 25%. it matters.
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