I seem to have an internal leak on one of my 18g billets. The turbos seem to have the same amount of play in them, but only one is leaking. It leaves a puddle of oil when I pull off the turbo outlet hose. Could I have a bad check valve or a leak somewhere? Any ideas? Thanks.

 

Any smoking when boosting?

 

This is typically normal. I am surprised its only one side. Mine does it in both...

 

Ahh I have 18gs and no oil in my pipes.

 

If the turbos are fairly new - was the check valve replaced as well when turbos put on?

If not, that's probably it.

 

I have new A3076 and I see a small oil leak only at the drivers side.It must be normal.

 

I asked Sean at the shop and no it is not normal to have oil in any pipes or puddles. My pipes are dry.

 

Since I track my car my tech told me to always keep the oil a couple of marks below full because as the oil heats up it expands and will overflow into the system. Anyone else hear this?

 

Never heard of that.

 

Ill swap one of the check valves from one of the old turbos. I take it that they are the fitting that the oil line screws into before the turbine shaft right?

 

I always heard to use new check valves when swapping turbos. Not sure why exactly, but I think they are pretty cheap from Porsche or Indy .

 

Looks like my 18g's (got them used) had the valves removed! Put some in and its all good now.

 

that is possible, i prefer to check oillevel only at real hot engine

 

The thermal expansion coefficient for Mobil 1 is approximately 0.0005 vol unit/F. Thus, for a 50 degree increase in temp, 9 quarts of oil would expand less than 3%. So I don't think it would make a whole lot of difference unless it was overfilled to begin with.

 

My car only lets me check the oil when it is up to temp. So doubt it will expand much more than the threshold my gauges will light up...