Ok here goes. Going back a couple of months my bottom end went on my 1997 wrx import. I then bought a bottom end off a my2000 uk turbo. Since then i have had a small drip of oil coming from the back of the engine Now my initial reaction was to take it back to the garage that done the work for me and was told it was the oil return pipe from the turbo which he said he would put back on properly. Now 2 weeks down the line after prolonged motorway driving e,g 70mile round trip,when i slow down at the end of the slip road my oil pressure drops to zero. Any ideas would be great as im stumped Sorry for the long story

 

If it drops to zero and the engine is still running the gauge is faulty. Would seize in a matter of seconds at zero pressure
Does the oil light come on too?

Take it back to the guy that built the engine if you got a warranty on it

 

No oil light coming on. Didnt think of a faulty gauge. Bit of a Blonde moment by me there No disrespect to blonde people by the way. My girlfriend is blonde