Brand new Borg Turbo leaking oil into compressor.

The s475 I put on the drag truck is leaving a film of oil in the compressor after running. I started with a -10 drain and was told that was the problem so I went to a -16 and now it’s not as bad I don’t believe. However it is still letting pushing oil out the seals. They look great when I tore it all apart everything looks like it hasn’t been ran. My truck does run pretty high oil pressure and has a lot of blow by due to ring gaps etc. warm I idle about 60-70 and when on the throttle it pegs a 100lb gauge. Any help would be appreciated!


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Did you eliminate the factory oil pressure regulator in the oil filter housing? I've seen one truck spit oil seals on its triples when using a remote mount oil filter housing without the OEM pressure regulator.

joefarmer said:

Did you eliminate the factory oil pressure regulator in the oil filter housing? I've seen one truck spit oil seals on its triples when using a remote mount oil filter housing without the OEM pressure regulator.

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No I didn’t. Not that I’m aware of. I’ve read some places saying with higher pressure to run a restricter in the feed line but was unsure don’t want to burn up a turbo either


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May want to contact the shop that sold the s475 and see what they recommend for restricter fitting. I haven't used them on my builds, but I haven't seen that much oil pressure either.

You shouldnt need a restrictor. Likely a boost leak, not enough CFM through the filter, or blowby restricting drainage, or an improperly sized drain adapter. We see 100+ psi through many turbos pulling with no issues. Turbos dont have "seals" they have piston rings. They dont go bad that fast.

zfaylor said:

You shouldnt need a restrictor. Likely a boost leak, not enough CFM through the filter, or blowby restricting drainage, or an improperly sized drain adapter. We see 100+ psi through many turbos pulling with no issues. Turbos dont have "seals" they have piston rings. They dont go bad that fast.

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Truck does have quite a bit of blow by. I’ll try add some more venting first before anything else. It is a lot less now that I’ve went to a bigger drain. However it still has a slight film. Does haze pretty heavily through the ccv that’s on the truck now.


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