Over the last 12 months my oil pressure has been steadily getting worse. She's done a lot of miles 170k but I had a steady 65-70 psia at 3000 rpm. Now I'm lucky if I 45 psi. In still get 25-30 psia at idle though. Any ideas.

 

If the worst comes to the worst, does the engine have to come out to change the oil pump?

Posi

You sure this is not the famous crap Z oil pressure sender problem. The damn thing wears out the variable resistance track so in the end it reads at high end when cold OK cos no wear there! but middle is crap as thats where max wear is but sometimes the low end is also still good hence 25psi plus showing.

 

If your oil pump or bearings were worn you would read seriously low at 700rpm hot after a run.

 

New oil pressure sender is the best part of £100 from Nissan. but prolly put your mind at rest.

 

Willie

Shouldn't be the pressure sender since I had it chnaged about 4k ago when it decided to drop to zero.

Mine also had a new sender, admittedly about 30k ago now but I see the same inconsistent readings again. Sometimes way down sometimes normal. But idle still about just to the first 30psi mark