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Oil feed is usually pulled from where the oil pressure sensor is, a T is a good idea here, so you can retain the oil pressure sensor and have an oil feed to the turbo. Oil return goes back to the oil pan, usually as high as possible, but it DOES HAVE TO BE ABOVE the oil level, when the engine is running, if it can be above the oil level with the engine not running all the better.

Coolant feed is usually pulled from the heater feed, the metal tube that runs accross the front of the engine, return is usually fed back in where the heater return is (thermostat housing).
 

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Hmm, I think the biggest problem with using the front cover is that the routing of the line will have to make a tight turn at the cover, which is not good for flow. Also if your mounting the turbo at the other end of the engine, as most people do, since there is space there, the line will be long, also making flow capability reduced. The return has to be on a downward angle from the turbo to the point where it attaches to the engine, if there are any low points, the returning frothy oil (the oil turns to froth in the bearing housing of the turbo), will not drain and you will experiance a blockage and blow oil through the seals out into the compressor housing and/or turbine housing. The oil drain back also has to be quite large, since as mentioned the oil will turn to froth and also has no real pressure , so a large return that only flows down will help with gatting the froth back into the engine where it will turn from the frothy state back into a liquid state. This is also where turbo mounting position is important, as high as feasable in the engine bay, to help promote drain back.
 

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the shorter and straiter the feed and return lines the better. When doing the feed it should usually start above the turbo, that is your best bet, and the return you should be able to route directly in the oil pan at the top, but like i said the shorter distance to the turbo the better, I would reccomend putting an aftermarket OIL PSI guage where you splice for the feed as to check for oil pressure loss. :D have fun
 
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