06 Solstice 2.4, engine rebuilt about 7k-10k miles ago.
I noticed some oil on the side and bottom of the oil pan. After poking around some more, I found evidence of leaks at:
- Where the turbo oil return line enters the block
- Where the turbo oil return line attaches to the turbo
- At a seal on the turbo housing on the compressor side of the oil feed
- Valve cover gasket, exhaust side. (Inline 4-banger)
When revving the engine in the driveway, I saw a bit of smoke. I then discovered some fresh oil on top of the exhaust manifold - just a few drops - that was burning off. Looks like it was ejected through the valve cover gasket when I revved the engine. The head has oil residue on the exhaust side below the gasket, but not above it. Thus, leaking valve cover gasket.
I checked the oil, and the level is way above the full line. The graduated portion of the dipstick is about an inch long (pretty standard). I see oil a good 1/2 - 3/4" above that. Hot, cold, whatever. Yes, I cleaned the stick.
My question is: if the oil change shop overfilled the car, would it cause these things? The car hasn't leaked a drop in several thousand miles, not sure why all of this would start happening at the same time. :(
If not, what else would suddenly cause leaks in 4 different places?
Also, I took a good long look at the return line and, in my opinion, it's not just leaking at the top and running down the line.
I built this motor myself. I was very meticulous about proper torque and sequence, gasket installation (not putting RTV on rubber gaskets esp. when the service manual said in Large Friendly Letters to not do so), etc. If the build was a problem, I would expect issues to have appeared much earlier.