S13 Low Oil Pressure?

[miklos]

After an oil change with 20-50 I was getting 12psi at idle. What is the lowest psi it should be? I put in STP after this and the lowest psi is showing 40psi when warm.

[KiLLeR2001]

Curious as to why your running 20w50 in the winter?

[miklos]

This was last July.

[nieko]

And this is so-cal... it wont get lower than 50s lol not that relevant.

[ghost_22_47]

I'm not sure what yours is supposed to be but mr RB26 runs at 25psi at idle, 50psi normal cruise and up to 75 or 80psi under full load. which I looked up to be normal.

Low oil pressure is caused by a resistance to flow. I'm not saying it is this but low oil pressure can be cause by excessive wear on the crankshaft bearings causeing the oil pump not to beable to pump enough oil to the area.

Also check your oil pressure sending unit

The oil pump could be loose or worn out causeing low oil pressure

Or oil pick up could be clogged

[miklos]

The odd part is it runs 50psi when cold and eventually will do to 25psi when hot.

[ghost_22_47]

The odd part is it runs 50psi when cold and eventually will do to 25psi when hot.

It's normal to have higer oil pressure when cold because the oil is still thicker and takes more to circulate through the system.