There are oil stains and soiled metal around my turbo and its various parts too. Degrease and wipe while it's off car.

IIRC the oil tube is held in place by the turbo being mounted, you sorta have to wedge it into place as your mounting the turbo. Now's a good time for any seal replacements in the area.

I found it was easier to do turbo R&R with the exhaust heat shield removed from the engine bay, the thing that keeps your coolant and air filter apart from the exhaust bits. Maybe you can get at all the bolts/nuts better this way.

How much oil is too much oil spilling out of a turbo? If you're burning blue because of it, or if the engine continues to run after you turn the key off because it's burning motor oil sucked through the turbo, or if you're leaving drips on the garage pad, that's too much.

Any guck inside the air tubes comes mostly from EGR. Remove EGR valve assembly for inspection then forget to reinstall it, use a blocking kit after you misplace the EGR. I think motor oil sucked through the turbo actually cleans up the intake innards somewhat.

I was tempted to clean the compressor turbine off - one blade of it was soiled but all the rest were shiny but I skipped using any cleaners inside the turbo, only wiped the outside. Sometimes its better to leave well enough alone.

You should be able to see some of the wastegate valve resting against its seat. Should not be ajar. You might be able to use a small mirror or feeler to see if the part you can't see is chipped or cracked or not seating for some reason. You can't move a wastegate by hand very easily. You could apply pressure to the orifice and watch it move though. Use a mityvac pressure pump model for that, or a very light touch on an air compressor gun that is toned down at its output will do for a quick experiment. Only need 14 psi remember!

For $20 I found the boost controller (just a piece of plumbing, really, with a spring and ball inside) was the ticket for my softening wastegate spring. Takes about 2 minutes to install, and a few test runs to set. 1/2 hour all done. The trick is find one with the right hose barb size on it, MBenz is odd from the industry normal on this hose for turbo wastegate.

The net result is you get the boost you want, can get back up to factory spec (about 0.9 bar), or higher if you have fuel over-delivery rigged up, or wanna add propane one day! Also, with the external boost controller, you get slightly quicker spool up to full tilt, which may result in slightly quicker car if you're really racing around. But overall, this is not really a performance mod other than to get back to stock levels.

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Cheers!
Scott McPhee

1987 300D