I did a search on the subject but not a lot of info came up. I recently bought some dexacool, since its parameters for heating and cooling seem to surpass other coolants, so I thought it would be good to go with this brand. Anyhow after reading a couple of threads just surfing here, I read by other members that dexacool eats o-rings, I was like OH !! If that is the case I am going to redrain the system and add something else. Also, I was just wondering what the history behind that dexcool stuff was? If it eats o-rings they shouldn't sell it. Well anyhow I usually use the green stuff from prestone on my other cars. What kind of coolant is the best? Would the green stuff work better than the orange stuff?

Thanks,
Lorenzo

 

I'm hoping this is applicable to this section as I am requesting answers for my fd.

 

Dexcool isn't really any better than "the green stuff".

Also, there are some lawsuits that are apparently pending saying that the corrosion inhibitors in Dexcool don't work worth a darn.

I would stick with the green stuff, maybe some Anti-Corrosive additive or PurpleIce/WaterWetter and distilled water.

 

Been using DEXCOOL for over 4 years without problems. It is recommend by many car companies now,
and something similar has been in Europe for a long time.


Eating O-rings is bullshit. Seems whenever someone trys a new product on older cars and there is a failure, they blame the new stuff.

Same **** as not using synthetic oil in a rotary engine.

 

Dexcool was developed in conjunction with GM for GM engines. It's some form of acid: read the labels that under heat and pressure it reduces corrosion. May be it works in the same manner as the sulfuric acid in hypoid gear oil?

I started using this with my second reman but kept seeing this white crud in the coolant and cap.

Found out Chrysler stopped using this product 2 years ago? Enough for me to switch back to green.

Running Evans NPG now.

 

Dave at KD had some issues with dex, orange crud near o-rings on a few leakers, and aluminum degradation. Not sure of significance of dexcool in those cases.

Search net for proper install.

My problem in the FD and another car was annoying leaks. Stuff leaked at places where green sfuff didn't. did not leak under pressure ... I assumed capillary action when cold and sitting a while. For FD, it was tube to tubesheet joints in mazdacomp rad, which did not leak when pressure tested at shop. Other car had same leak spot, and also at hose connections.

I switched both to Zerex G05, which is a hybrid coolant (between dexcool and green stuff) used by mercedes, ford, and chrysler, and both rads stopped leaking. I assume some silicates act as 'stop leak' for micro leak paths.

Main benefit of dexcool is long life, not heat transfer. Audi considers it 'fill for life'. The G05 is long life, but not lifetime.

I like G05.