[SleepyHead98]

head gaskets on these engines are very common. I am not sure when GM replaced their nylon intake gaskets, as DEXCOOL (death cool, Dex kill, Death Kill) is known to eat them up. I have seen them also eat up head gaskets just enough for corrosion to start taking place, causing head gasket failure. Toyota runs dex cool BTW.

I did an 07 where death cool ate up the head gasket. I might get ridiculed for this comment, but don't use dex cool. Use the walmart 8 dollar a gal, 150000 mile coolant. It seems to be the safest. There are alternatives, but they are expensive. Thing is, aslong as the heads or block is not cracked, it can be fixed. I would do it yourself though, as you are looking at a 1500-2k job for a head gasket job at a shop (materials only cost about 200 for high end gaskets+100 for heads to be planed). Will take you about 3 days to get it done right the first time. Post back or PM me if you have decided to do it yourself and need advice.

With death cool, and all OAT (Organic acid technology) type coolants, they coolant cant get low, air cannot get into the system, and it must be changed out sooner than 150/5 years. If not, it will turn acidic, and start munching on all plastic parts, eventually alum parts.