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Old 01-22-2014, 08:37 PM   #11
suss6052
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This document explains how your oil pressure is measured or interpreted on the gauge.

The engine temperature, engine oil pressure switch, and engine speed data are required for the additional gauge cluster to calculate it.

Oil pressure is always highest on a cold engine as well as at high engine speeds, the gauge reflects this indirectly.
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Old 01-22-2014, 09:08 PM   #12
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When the oil is cold, the oil pump is at bypass mode, and the oil pressure is typically around 80-90 psi, and dropping with oil warming up; when fully warmed up ~200F, the pressure at high speed (>1500 rpm) would be around 50 -60 psi, and 15-20 ish at idle. Due to oil shear thinning, fuel dilution (a bit fuel in oil) and filter pressure loss increase, it's not surprising you got a bit more oil pressure right after oil change.
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Old 01-22-2014, 09:28 PM   #13
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Originally Posted by Ben_n View Post
When the oil is cold, the oil pump is at bypass mode, and the oil pressure is typically around 80-90 psi, and dropping with oil warming up; when fully warmed up ~200F, the pressure at high speed (>1500 rpm) would be around 50 -60 psi, and 15-20 ish at idle. Due to oil shear thinning, fuel dilution (a bit fuel in oil) and filter pressure loss increase, it's not surprising you got a bit more oil pressure right after oil change.
Technically this is not correct. The oil pump is not bypassed at all ever or the oil would not flow through the engine. I think you mean that with elevated pressure the oil filter medium is bypassed briefly until the oil heats up a little bit.

That's ignoring the fact that since most people freaked out about seeing the actual fluctuation of the oil pressure that most vehicle manufacturers went to either using dummy lights or dead gauges that don't so much as fluctuate when the engine is running until it's already too late and damage is done.
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Old 01-25-2014, 04:37 PM   #14
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Quote:
Originally Posted by suss6052 View Post


This document explains how your oil pressure is measured or interpreted on the gauge.

The engine temperature, engine oil pressure switch, and engine speed data are required for the additional gauge cluster to calculate it.

Oil pressure is always highest on a cold engine as well as at high engine speeds, the gauge reflects this indirectly.
Thanks for the reply. So, the engine oil pressure switch is just a switch for low oil pressure and does not actually measure the oil pressure?
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Old 01-25-2014, 04:47 PM   #15
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Thanks for the reply. So, the engine oil pressure switch is just a switch for low oil pressure and does not actually measure the oil pressure?
I'm not sure if it's only for low pressure, but the oil pressure gauge generally will read the same no matter what the oil in the crank case is based on the engine speed and temperature as well as that switch reading. It's a bit more sophisticated than an idiot light that the damped engine coolant gauge, but it's still not 100% raw data, only the boost gauge is real.
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