Thread: Coolant Loss: no noticable leaks

Originally Posted by nik12937

Look at where the heads meet the lower intake. If you see a black/plastic gasket, you'll definitely have to replace it soon. If it's a silver/aluminum gasket (the newer style) then you can afford to wait a bit, but really the sooner the better. You never know when it might get worse and cause you to ruin something on the bottom end.

I'm sitting at 100k miles with an 08 model. I have verified that I have the silver/aluminum LIM gaskets and I was under the impression those do not need to be changed out. From your post it sounds like you would still recommend changing them - why? Are they still prone to eventual failure and considered a maintenance item? Rethinking my situation

I think he is talking about the head gaskets there. The newer models had the aluminum head gaskets I believe. It really all depends on how you drive and if it has ever over heated on you and stuff. It's not a hard job to do honestly. But like he said, if you're going to do it, do it right and change everything. upper and lowers, valve covers, coolant elbows, MAP sensor o-rings, fuel injector o-rings, tb gasket, tstat gasket, etc. It will put your mind at ease once all that is switched out.

Originally Posted by Slick2500

All series 2 and 3 cars used the same head gaskets, gm never changed them. I think you mean the intake gaskets were aluminum on newer cars not the head gaskets.

Sent from A Galaxy Far Far Away........

You might be right. I can't remember correctly. I know they switched something to aluminum. Now i've heard different sides to whether it was a good or bad thing with aluminum.