tbwo

hi,
i have a 99 impreza turbo and it has an after market oil pressure gauge which for the last year has pretty much constantly only read 3bar. yesterday however it started reading 6-7 bar and sometimes off the gauge which maxes at 7 and whenever i start it up it rises to this pressure over a few seconds.
i have been told it could be a faulty gauge but i have a feeling it is something else. Its on 86000 miles and hasn't had an oil change since 75000 so i am considering doing an oil/filter change in case the filter is blocked and it needs one anyway, but i don't want to risk doing that only to find its something else and have to drain my new oil out. I was wondering if anyone else has experienced anything like this and what it turned out to be or any useful information as i'm not the best with cars.

Thanks for any help

Turbotits

iTrader: (2)

I think 3 bar at cold idle is low anyway. I would expect 6 or 7 cold idle. What pressure do you see at warm idle? Maybe the guage was at fault and is now reading correctly

tbwo

it usually reads around about 3 all the time even when i've been driving it for ages (the gauge reads from 1-7) now it reads about 7 from start and when i rev it can goes off the gauge.

Thanks

Turbotits

iTrader: (2)

it has been reading wrong then. No matter what pressure. They should always read lower when the engine is hot at idle and then go up when the engine is reved

tbwo

ok i'll try getting a new gauge sorted then was just worried it was goin to be something expensive she's been costing me quite a bit recently, thanks for your help Turbotits!

scooby1doo1

iTrader: (7)

mine reads 100 psi

mit

iTrader: (10)

The pressure on cold start should be 7 bar at idle,more when the revs are up,which puts it off the gauge on mine.This is correct.Once the cars warm,the pressure drops to 3bar at idle,again rising to about 6-7 when revs are up.
If the wire on the sender is shorting to earth,the gauge will read max.Check this first.

jaytc2003

iTrader: (1)

which is about 7 ish bar

scoobjam74

iTrader: (11)

9 thousand on the same oil !! MATE DONT DO THAT AGAIN most people recommend changing every 4 thou at the most and i change it every 3 thou

as said mine runs at 95psi when cold and up to temp its 85 when at 1500 rpm and above and on idle warm its 40 - 45 psi