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Discussion Starter #1
I just did an oil change with rotella 5w-40 full synthetic and archoil 9100 friction modifiern it gets really cold here. I filled it a little bit to much but I have a lot of blow by! Its so bad its coming out of my boot and leaking into the valley. Could to much oil cause this excessive blow by? Could my boots just be bad and finally starting to leak oil? It was just boosted to 24 lbs and the boots held fine which makes me think the boots are fine. Or could the turbo be going bad? Any input would help! Its always something with these trucks! :mad:
 

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Stuck in Commiefornia...
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Blowby doesn't typically start as the result of an oil change or the installation of an additive. Take the oil fill cap off and put your hand over the tube, if you dont feel excess pressure, maybe you are seeing something else that's coincidental.

Could also be that somehow a bit of condensation if you went ahead with the CCV relocation from your other post.
 
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Senior Member
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First step is to correct the oil level by draining some out.

Boot-s worn is a very likely cause, and very common.

Possible failing turbo oil seal could cause this too.

Have many trucks running 5w30 and 5w40 and AR9100 with no issues.

If you have excessive crankcase pressure like Idaho mentioned to check, then thats another issue altogether, likely lower end wear.

Also make sure your not getting fuel dilution into the motor oil, make sure the oil level isn't rising slowly.

Harry
 
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Discussion Starter #4
I do beleive that I have to much crankcase pressure as my rear main seal has started to leak a little bit. Hope that its not and the seal just went bad after 135000 miles. I have not yet done the CCV reroute yet though, havent had the time. I dont believe that im getting any fuel dilition I know i filled the oil up to much forgot about the 9100 i put in. Stupid rookie mistake. What would you say would be to much pressure? How would I know? Will it push my hand off the fill tube? Would i check the pressure during cranking becuase thats when it would be highest or just at idle?
 

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Alot of times the rear main looking leakage is actually the bed plate leaking. Mine has leaked since new, has never gotton any worse, and just leaves a drip on the bottom of the bell housing, but rarely leaves a drop on the ground.

Correct the oil level and change the boot-s is what I would do first.

Do the hand pressure test at idle, also look for smoke coming out of the oil filler cap.

These engines circulate quite a bit of CCV oily gasses, it is normal.

Harry
 

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Discussion Starter #7
Thank you Harry with your knowledge my truck has stayed running pretty good! My truck won't even drop onto the ground and has been seeping for almost two years. I'm unfamiliar with the bed plate could you tell me more about this?
 

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Just remembered, if the boots are leaking up by the turbo, it can run down to the bell housing area.

The bedplate is the lower part of the crankshaft journals, as seen here...
http://www.backglass.org/duncan/ps60_manual/ps60_022.jpg

Resealing one would take some time, and really not worth it for a small leak in my opinion. If the leak were severe enough, then one has no choice.

Harry
 

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Oil from the top of the engine between the heads can make it down to te bottom
Of the bell housing, but it would be predominantly external to the bell housing. If you remove the bell housing inspection cover, you should be able to determine if you have a rear main leak or a front pump/converter seal leak. It's easy to tell. The back if the flex plate and inside of the inspection cover will have the majority of the oily residue and the residue will smell of diesel and used engine oil. If it's the converter/front pump seal, the majority of the residue will be on the converter and bell housing side and the residue will smell like ATF.

If it's not marking it's territory, it isn't leaking...
 

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Discussion Starter #10
So you'd say that if I can't clearly tell where it's leaking from to not worry about it? I still haven't had a chance to drain any oil either I'm living at my girlfriends condo while I buy a house. They aren't aloud to work on vehicles and some ***** will turn me in. I have to be sneaky around an old retired single lady. It's been a challenge. I got the wrong boots anyone know of anybody that needs a mishimoto boot kit for a 6.4? Brand new in box!
 

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If it's not leaving a drip on the ground overnight where you park, it's not worth messing with. Buy a can of foaming engine degreaser, spray it on the greasy area, drive to a self service car wash and pressure wash the area to get rid of the grease every once in a while so that if you have to work on it you don't get covered in grease.
 
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