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Topic Review (Newest First)
01-25-2014 05:47 PM
suss6052
Quote:
Originally Posted by shawndevaraj View Post
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.
01-25-2014 05:37 PM
shawndevaraj
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?
01-22-2014 10:28 PM
suss6052
Quote:
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.
01-22-2014 10:08 PM
Ben_n 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.
01-22-2014 09:37 PM
suss6052

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.
01-22-2014 08:31 PM
shawndevaraj
Quote:
Originally Posted by shineboy View Post
My car runs basically the same: pegged when cold, normal cruise ~50% (~35lbs)... I agree idle looks alow 25% or ~16lbs when warm. I am at ~3000 miles and just about to do the first oil change
Hey guys, my oil pressure maxes out at just under 70psi at 1800 rpm on startup. It takes about 5miles before the pressure starts dropping. The reason I am concerned is because the pressure seemed to jump by about 5psi at 4800miles and when I did my first oil change at 5000miles, the pressure did not drop. Also, I started a brand new ST and revved the engine to 2500rpm and the pressure was still lower at around 60psi. So if you see an ST doing 55mph on the freeway, that is me freaking out about the oil pressure.

The dealer says that it is normal, but I am sure that it is not. To confirm, could you please reply with your cold startup oil pressure at 1800rpm? Thanks for your help.
12-21-2012 11:03 PM
acbauza
Quote:
Originally Posted by shineboy View Post
Supplment says see manual. Same as standard Focus but I will go by severe duty since its turbo
For the sake of the turbo and all the high temp that's in there use the full synthetic. Having already done mine at 1200 miles after tracking the car I can say you will notice a difference in the oil press and oil temps.

I change mine every 3000 to 5000 miles under "normal" conditions, but under track conditions I will dump it every 3000 period.
12-16-2012 07:16 AM
shineboy
Quote:
Originally Posted by aernan View Post
I have not looked in the manual. What is the oil change interval?
Supplment says see manual. Same as standard Focus but I will go by severe duty since its turbo
12-16-2012 01:31 AM
aernan I have not looked in the manual. What is the oil change interval?
12-15-2012 05:31 PM
shineboy My car runs basically the same: pegged when cold, normal cruise ~50% (~35lbs)... I agree idle looks alow 25% or ~16lbs when warm. I am at ~3000 miles and just about to do the first oil change
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