Diesel turbo with no power at low revs

Sounds like piston blow by, as the gap increases and diesels have such high compression. When the turbo kicks in, the pressure is restored.

https://www.google.com/search?q=Toyota+Corolla+2+Litre+diesel.+Why+loss+of+power+at+low+revs+when+warm

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excessive fuel and if turbo operation , failing turbo
check for excessive fuel pressure , leaking injector seals
turbo not operating

there are two oil lines to the turbo
one line is a pressure line that delivers engine oil at pump pressure to the turbo
the other is a low pressure line that drains the oil back to the sump
determine which line is leaking and replace or fix and replace the gaskets or "O" rings

It is part of the cause,

Click this link below for oil leak and rev issues:-----http://repairhelpcenter.blogspot.in/2012/02/car-has-oil-leak-and-shuts-off-at-rev.html
For oil leak problem,click the link below.This are direct hel links to troubleshoot the problem :-----
Common Causes of Car Oil Leaks?http://schematicsdiagram.blogspot.com/2011/12/common-causes-of-car-oil-leaks.html
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Troubleshoot Car Oil leak?http://schematicsdiagram.blogspot.com/2011/12/troubleshoot-car-oil-leak.html
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leaking oil from oil pan?
http://howtobyme.blogspot.com/2011/11/kia-sportage-leaking-oil-from-oil-pan.html
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Car Turns OFF due to low oil pressure warning light?http://schematicsdiagram.blogspot.com/2011/12/car-turns-off-due-to-low-oil-pressure.html
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leaking oil from timing cover?http://technoanswers.blogspot.in/2012/02/toyota-corolla-leaking-oil-from-timing.html
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How to Check Differential Oil Leaks and Replace Oil
http://schematicsdiagram.blogspot.com/2011/07/how-to-check-differential-oil-leaks-and.html
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Car oil leak?
http://schematicsdiagram.blogspot.com/2011/12/car-oil-leak.html

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Car oil leaks from valve cover gasket?http://schematicsdiagram.blogspot.com/2011/12/car-oil-leaks-from-valve-cover-gasket.html
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Oil leaks from air filter ?http://technoanswers.blogspot.com/2012/01/oil-leaks-from-air-filter-on-ford.html
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Rear oil seal leaking?http://schematicsdiagram.blogspot.com/2011/12/rear-oil-seal-leaking.html
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This will help.

Most oil leaks on this engine occur in the valley of the engine at the back of the oil pump. If you look directly down into the center of the engine infront of the turbo you will see the back of the pump and the potential leaks at the plugs on the pump and the output lines to the heads.

Does any one have a idea a friend here has changed ecm, inj, fuel pump checked conector at fire wall ,fuel and has a short wrecker tow f450 99 and will be going down the road and he says the thing just loses all power and kind of just won't do over 15 to 20mph and lets it sit and he says it will do it again. I am not sure how long it takes but since I don't work on diesels I figured I would have the experts that do if anyone knows it's you guys any help he is in Charlotte NC I can put you with this guy he has had it to all the parts changers and no luck Thanks Mark 704 492 1647

There is a oil drain return from the turbo charger to the sump. If the sump oil level covers the outlet into the sump, oil will build excess pressure tin the turbo causing the sealing rings to leak oil in to the intake manifold. This would cause smokey exhaust and loss of oil. Try this. Drain the sump completely, refill with the exact quantity of oil to Mazda spec. Dip the oil and if the new oil level is lower than the full mark on the dipstick, you have found the cause of the problem. Mark this new level with a scriber or file and fill only to this new level. Hope this is the solution.

turbo seal is leaking, that is the only way this could get there.

MY 2001 7.3 was leaking the same way. The dealer said the o'rings under the pedestal were leaking. I had the dealer replace the o'rings. By the time I got home, it was leaking again. Called the service department and told the manager,and they put on a new pedestal and o'rings. They only charged me half price for the pedestal and no labor. That did stop the leaks.