Originally Posted by mello
I heard that dex cool eats up the intake tho...is this at all true in any way??
There has been a debate on Dex-Cool causing problems for years, some say the EHA-2 in it can become too acidic if oxygen is trapped in the coolant system, this usually only happens from improper coolant maintenance from what I have read.
I have a 96' Park Ave and have used Dex-Cool since the car was made in '96, I replaced the coolant at fairly regular intervals, and the only thing I think the Dex-Cool did was plasticize my UIM where the throttle body coolant ports are, the lip that holds the gasket in place fell apart as I removed the TB gasket, I am not 100% sure but I think the Dex-Cool'* EHA-2 could have gotten a little air in the system from me not knowing I needed to bleed the air out once I replaced the coolant, so I guess that was user error more than anything.
I will say the aluminum fins inside my radiator look like new still, so the coolant protects the aluminum really well if maintained properly.
Most people that use Dex-Cool either continue to use it, or they do a full flush and replace it with Zerex G-5.
I think you would be fine continuing to use Dex Cool as long as you replace it regularly, and make sure no air is trapped in the system.
I know they recommend replacing it every 150k or 5 years, but I still replace mine around every 75k, or 3 years, whichever comes first, I plan to get a radiator pressure test kit soon so I can know when my cap ever starts to fail to hold the proper PSI, because if your system is not holding the right pressure the engine is going to run a bit hotter, and that is not going to help the nylon 6,6 LIM gaskets, UIM, or coolant elbows.
Here is a good read on Dex-Cool, but it can be a little confusing..