I wanted to know what size oil feed line you guys are running on your S372 turbos , Iam running a -3an right now and I notice I get some oil in the inlet of my turbo and wanted to know if this was normal or if I should switch to a -4an line for the turbo to drop the pressure, thanks

 

S372 requires a -4an oil feed.

 

up top for more info

 

Pretty sure they require -4 as well.

 

it should be a -4AN and no smaller and no oil restrictor.
here is another thread covering the same topic!
https://honda-tech.com/forums/showth...=s372+oil+line

 

That will work.

 

ok , thanks guys I will swap it over this week to -4an line , I guess the -3an is to much pressure because I get some oil residue in my inlet , the -4an will drop pressure but flow more, makes sence.

 

Correct. Those S372s use a very large turbine shaft for the wheel that matches to it, so you'll need all of the lubrication and cooling effects you can get from the oil used.