coolant & oil mixing
 

Have this issue -ffound out when I removed radiator cap & found this gooey thick mess - its an 08 SS & was told there was issue with these blocks being pourus - Does anyone know if this was all of 2008 models or the earlier production months - Someone said they thought it was 09 before they changed the block - also understand it could be a blown head gasket ( which was replaced approx. 20 k ago by the P O )
Also could it be a faulty oil cooler where oil & coolant could mix? did overheat on me --got to 260 before I noticed --thats when I started checking . only a tiny bit of oil on the end off dipstick but was not gummed up like the radiator is - where is the oil cooler located if that could possily be the culprit - Afraid its more serious than that however --any advice muchly appreciated

The porosity is on 2009 SS; but it is not what it sounds like. It is more like pitting from grains of sand in the casting process.
The oil cooler and the turbo both have seals between oil and water. My money is on the turbo.
If you don't know where the oil cooler is you need to go to a professional.

Thanks Donbrew- How in the world would you go about determing where the problem is - ITstands to reason that if the head gasket was blown , you would see the same thing on the oil stick that you would on the radiator cap ?? Am I right -- also the same for a porous block
By the way getting conflicting info on wheteher the porous blocks were 08 or 09
someone had told me that it was 08,s & 09 was a diffferent casting ??

If it was the "porous block" issue, it would have been an issue many miles or years ago. That was an issue that was noted by GM to occur early in the life of the affected engines.( note: not "all" of the 2.0 from 2008-early 2009 had this problem.)
My guess is with Donbrew. Turbo may have puked or head gasket is blown.
If you have anywhere near 100k miles or more, you should consider a new engine/turbo.

Did everyone miss the part where the coolant temperature went to 260*? High probability that the engine is toast :toast: :stuffhittingfan:

I caught that part, new LDK or LNF from ZZP if they ever come off back order.

https://zzperformance.com/products/ldk-long-block

https://zzperformance.com/products/ldk-long-block

if the oil cooler corroded out, then you engine is more money to tear down clean out and rebuild, all bearings must be replaced, the cylinder walls bored and honed, new pistons and rings , at that temperature you probably cracked the cylinder head. A new head gasket won’t fix that! Labour at the machine shop will be well into $5,000.00 plus parts.

It only hit 260 degrees for about 1.5-2 miles till I got home --still could have warped or cracked the head ??

260? And for 1.5 - 2 miles?
How did it get that hot?
The answer to your question is, YEP, could have.
Aluminum doesn't lie that much heat.
Change fluids, Do a compression check, and be prepared for a major expense.
You may have gotten lucky.

Compression test won’t confirm a head gasket problem between oil gallery and water jacket, or if the oil and coolant are mixing in the oil cooler. The coolant will wash do the cylinder walls and bearing friction surfaces, that means the main and rod bearings, so the crankshaft journals may be damaged. Then there’s the cams, oil pump, timing and balance shaft chains.

It boils down to the term “ it’s toast” but if you decide to tear it down and find no major damage, awesome.

As Harry Callahan asked, Do you feel lucky, well do you?

Once again, "porosity" does NOT mean holes in the block, it means tiny bubbles that turn into pits on surfaces after the metal is machined. The bubbles are left behind by the "foam casting" method used on early LNF blocks. If one or more of the pits is of the right size and the right position it might manifest as a blown head gasket.

Why did it overheat? Is that fixed?

Sometimes oil gets into the coolant sometimes coolant gets into the oil, rarely both ways.

The fact that you say the oil was empty leads me to think the seal in the turbo is blown and that was burning oil and letting the oil get into the coolant.