I have a 4g63 stroker and I can't find where the oil leak is. When I press the gas hard a smoke appears from the exhaust. I checked the compression 175 across all 4. I changed to a new turbo I changed the valve seals. I checked the crankcase pressure -0.2 bar to 0 bar when in boost and the car still leaks, what else I have to check? The car has Evo 8 oil filter with oil cooler.

Thank you

Here is a picture from the engine.

Does it smoke when starting up after sitting or on decel while in gear?

When idling it doesn’t smoke at all when I give it gas it smokes and when I decel and coming to a stop a give it gas to clear the exhaust and it smokes a lot. At full throttle because i have boost by gear it smokes more at 1st and 2st but at third it doesn’t smoke as I see it from the rear view mirror

Please help I checked everything…

Smoking on decel usually means valve seals. The vacuum inside the engine / intake ports is pulling oil vapor through the seals. Could also be valve guides as well. Can you check inside the intake and exhaust ports and look at the valve stem and see if they've got oil built up on them?

Also are your spark plugs covered in oil?

When I took off the spark plugs they were black and the valve seals I change them now.

TasosEclipse said:

When I took off the spark plugs they were black and the valve seals I change them now.

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Black and covered in oil are kind of different things. And I get you changed the valve seals but obviously something is still happening.

They weren’t covered in oil they were just black . I know thats why I wrote here to hear someone else if it ever happened to another one.

What is your crankcase breather attached to? Does it flow free?

Free flow only one line to take it back and down

How about the pcv valve? Good working order and not clogged?

I have two change them both checked with pressure everything good . The oil consumption is 500ml to 300 kmh.

Do you still have baffles inside the valve cover?

Yes I haven’t done anything to valve cover.

Had same issue long ago - I had to change valve seals 2x the first new set didn’t seal well enough bought a diff brand on 2nd run - I think blue ones, as if color matters from brown ones.

Difference was barely noticeable except for once the blues were on , unlike the browns they refused to come back out.

I used the Chrysler tool to remove the valve train assembly with engine In car and cams / belt - still In.

Maybe it doesn’t apply here but it’s worth mentioning

The consumption of oil is big that’s why I changed the seals

Do you see oil in the intake piping? During a boost leak test with your tester on the turbo inlet, does it leak boost into the crankcase?

nothing on the inlet. on the crankcase i measured 0 bar on boost.

How do the valve stems look when looking into the intake and exhaust ports? Burned oil built up on them or no?

What turbo oil drain are you using and where is your feed from?

Anfurnyy said:

What turbo oil drain are you using and where is your feed from?

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You beat me to it

dwb said:

You beat me to it

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Tale as old as time it seems happened to me too

turbo oil pressure from the head and the drain is 14an

Anfurnyy said:

How do the valve stems look when looking into the intake and exhaust ports? Burned oil built up on them or no?

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what about this?

Really there are only a hand full of places where oil can escape into intake or exhaust.
Valve cover
Turbo
Valve stems
Head gasket
Piston rings
Some other abnormality like cracked block, piston, or head

If something was wrong with pistons or piston rings I haven’t seen in the compression test?