Conversation Between Ahsai and itiosso

Thanks for the quick reply. I called Porsche that did the PPI and of course they said the technician inspected the expansion tank and found nothing wrong... which I believe highly improbable. I cleaned the majority of that gunk sitting in the coolant tank around the walls and top of reservoir and now there is just a slight layer on the surface.
Of course anything is possible, but my belief is that given the engine was worked recently, it could have had a problem like this which was fixed and there was some residual dirt in the cooling system. This car has barely been driven in the past few years and perhaps my long trip home to VA from when I picked it up in PA might have moved some stuff around a bit.
No signs of coolant in oil, oil pressure is good and temperature never goes past the 8 at the 180 mark.
I am crossing my fingers it might need a coolant flush and a new expansion tank/cap. Worst case scenario in my hopeful world would be a oil cooler replacement.

Hi itiosso, sorry to hear your problem and it sounds like a cracked head. It sucks that the PPI didn't catch the intermix condition, which btw should be quite easy to catch.

I would try to negotiate with them and see if you can get any help from them. Worst case if you need to repair everything on your own dollar, you will at least have to diagnose which bank is the problem (usually the crack can be seen from within the spark plug hole on cyl #1 if memory serves. The head can be repaired by Hoffman auto machine (Len is the owner and you can tell him I sent you). Whatever you do, you need to drain out the coolant asap as the oil will eat up the rubber coolant hoses and replacing them all (29 of them) will be very expensive.

It's best if you can start a thread to get more opinions and have more eyes on your problem.

Hi Ahsai,

I have been reading some of the numerous threads on intermix/coolant and found out my recent 99 C2 996 purchase is showing symptoms of oil mixed in the coolant, but not the other way around. I had the car inspected by Porsche before the purchase and cant believe they missed this. Really concerned on the implications and would like some guidance if possible.

THank you very much.