well this is what it is, its always used to stay at 4 bar no matter what, then suddenly the other day i boosted the car for ages, parked up let it turn off after a minute & then i started the car after 5 min & the pressure had dropped down to 2 bar & it still is the same. the oil pressure warning light seems to go on & off on & off from 0-1500 revs soemtimes. Its just really strange, on a cold start the pressure will rise to 4 bar, as how it should b, but if i turn the car on & off it will drop down to 2. mind you the cars due service its been around 4k could it b because ofhte oil velocity? i'm using Castrol GTX Magnetic 10 40