Hi , my HV 02 has started to trip out before it gets to trip pressure, I changed the oil about 4 weeks ago, I Used Air Force 200

SOURCE: oil light is on

I had the same issue on my '01. I hoped the issue would just go away, but when it didn't I took it into the dealership. They found a sensor that had gone bad and replaced it. Fortunately, it was not engine-threatening. As I understand it, oil lights are not designed to tell you if your oil is low, it usually means your pressure is low, which could mean a compression issue. Better get it checked out soon if you haven't already. You may want to find a good auto repair shop (I found one on cartalk.com) rather than taking to the dealer.

SOURCE: rough idle / varying oil pressure when accelerating

Ok not to keen on newer vehicles actually prefer the carburated ones, but oil pressure is supposed increase on your gauge when accelerating. If it wasn't going up before and just staying at 40 the needle might have been stuck. But idle should be 40 lbs and when you work the moter (reving or driving down the road) the guage should show an increase for every 1000 rpm above idle. Second if you can get a hand held scanner (bought mine off ebay for $30) check for any codes in your computer you will probably find that you either have a bank running wrong or some other sensor that needs to be changed. I'd go with getting my own scanner it saves alot of money and time, garages make their money here.

SOURCE: OIl pressure light flickers

change the oil pressure switch or the wrong oil

SOURCE: Changed oil pan gasket now i dont have much oil pressure

If oil pressure was fine before you changed the gasket, it's likely that some debris was loosened up (probably under the pan baffle) and got onto the oil pump pickup, restricting flow. The only other cause of low pressure would be worn engine bearings, which would not happen just by changing oil pan, unless you messed with either bearings or pump while pan was down. Remove the pan and carefully inspect the pump pickup for debris!!! DO NOT DRIVE VEHICLE 'TILL YOU HAVE CORRECTED THIS OR YOU WILL DAMAGE BEARINGS!!!

SOURCE: 2005 mazda 3 2.3l that is burning oil (no leaks)

possibly the pcv but check if your cars exhaust smoke is blueish or white in color if it does and your car doesnt have an oil leak then sure its burning engine oil along with fuel, the piston rings is defective, since you replaced engine oil the additive that the owner has put with the oil to prevent blowby is gone thats why it starts burning oil.....