Macgyver2484

iTrader: (3)

I drained my oil about a month ago and noticed nearly 7 quarts came out. As the oil analysis shows, I have tons of gas going into my oil.

If I didn’t change my own oil, I probably would have never noticed. This started sometime between the ZFR install (October) and now which I think has little to do with it. Other mods are just bolt on's (Intake/Exhuast). Anyways, the car runs great. No engine codes or performance issues. A compression test shows all cylinders being between 150-155 PSI and holds it there.

I’ve been changing my oil every 500-750 miles to prevent the oil from getting too diluted. The analysis shows SAE 30, but I’ve been running Mobil 1 5W-30 its entire life. Anyone have any ideas on what do check or replace?




Update: High pressure fuel pump was leaking. I put the fuel pump in the other day and everything looks good so far. Thanks for the help guys.

EXsoccer1921

iTrader: (14)

i would say the rings are going out prematurely. idk what the lnfs normally come out to with a compression test but 150-55 seems low.

raver0789

Depends on the elevation...What tune do you have and how rich is your tune.

SylverSS/SC

iTrader: (3)

I would say rings too but wouldn't that blow out the dipstick?

Speed_Thrills

iTrader: (5)

Sub'd for info..
Sounds like bad rings to me too..

user 72239

iTrader: (4)

Usually a compression test rules rings out and at 150 to 155 the rings are good. My Lnf tested 125 across the board but I am at 6000 ft. Sounds like your injectors are leaking

cleanxfe

Change your direct injection pump its leak fuel into head

Frogstofall

iTrader: (1)

I'm not sure a good compression test necessarily rules out the rings. 150psi is nice but the fuel is getting sprayed at 2000psi during the compression stroke. Couldn't that push past the rings? I like the comment about the high pressure fuel pump but I don't think any part that comes in contact with the oil sees any part of the pump that has fuel in it. If it did, that would be such a serious leak, the car probably wouldn't run.

Edit: Then again, the piston on the fuel pump probably has a seal too that I guess could leak fuel into bore there... Hmmm....

Iam Broke

iTrader: (10)

This.

Macgyver2484

iTrader: (3)

The pump in the gas tank? What is the part number?

BLAZIN07SS

iTrader: (7)

No, the cam driven high pressure fuel pump on the head

Macgyver2484

iTrader: (3)

Expensive or hard to replace?

prevsrt4owner

This article has some good points. How Does Gas Get in Engine Oil? | eHow.com

LE5_AJ

Try a cylinder leak down test. They also have a good point about the high pressure fuel pump.

Chevycobaltss3

iTrader: (2)

Yea my car did this.. The pump was leaking fuel into the engine...

prevsrt4owner

Is it the o-rings for the HPFP?!

Macgyver2484

iTrader: (3)

That article doesn't apply to direct infection and says to simply "replace the piston rings first and then change the oil". That's just asinine.

My engine has 30k miles on it. I really doubt the rings are blown out. I just changed the stock turbo out 1000 miles ago. You guys on here act like swapping piston rings is like rotating your tires lol.

prevsrt4owner

I know our cars are DI, haha. Yeah, it would be labor-intensive to swap out the rings.
Buttgyver, everyone has offered advice, so why don't you stop acting like a sissy and fix it yourself. Everyone has been wrong in the thread. Nobody knows anything about cars, either.

bigturbohhr

its the DI Fuel pump, i had the exact same issue!

Macgyver2484

iTrader: (3)

Did you chanage it yourself? I assume I'll have to take off the valve cover and all that if it's cam driven.

tomj77

iTrader: (2)

150-55 is what they normally come out to with compression test. thats normal

user 72239

iTrader: (4)

Pretty easy to change the hpfp. 2 bolts on the head

Macgyver2484

iTrader: (3)

Anyone got a picture?

user 72239

iTrader: (4)

https://www.cobaltss.net/forums/how-...81/index2.html

Follow that guide, it shows you how to take your HPFP off. literally takes 20-30 minutes. I've had mine off a few times to reseal it.

Macgyver2484

iTrader: (3)

Any good suggestions for fuel resistant gasket maker?