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I have an 02 STI and it is fitted with Defi gauges.
I have never had an oil pressure gauge before so am not sure what readings to expect.
Once the car is pretty hot when driving the gauge reads about 6.5 kg/cm2(is this the same as bar?) but when idling when hot the gauge reads about 2.5,this seems a little low to me,should I be worried or is this normal? Once above 1000 rpm the pressure rises to above 4.
Location: Stirlingshire; Wrx type RA STi version 2 V-Limited; #097/555
Your pressure readings are normal. (Kg/cm2 = Bar).
I would only be worried if the oil pressure dropped to 1 Bar or lower. Coming into the pits after 15 or so minutes on track dropped my oil pressure to approx 1.6 Bar for a short while (untill it cooled down a bit).