I have known about this for a few years but I thought that new Silverado owners or some who actually trust their GM Service Manual or even worst their Service Manager might feel the same shock that I did after learning that GM intentionally put Phosphates into the Dex-Cool Antifreeze. You who are not familiar with this and the many class action lawsuits that are now ongoing need to check out each of the links I provided below. I can only tell you one thing.
FLUSH YOU RADIATOR ASAP<- and GET THE DEX-COOL out of your trucks/cars. Use any GREEN Anti Freee such as "Prestone Green or Peak," but NOT Texaco or Penzoil as they make the Dex-Cool for GM and are identical. I hope this helps those who care as much about wasting money to satisfy GMs negligence as I do. The links below each offer a different problem Dex-Cool has brought on to GM owners.
GM states in the owners manual that it's Dex-Cool IS good to 150,000 miles. They now state that just because it is writen, is is NOT a warranty - WHAT THE HELL?
GL
Greek
GM knows they have a problem with Dex-Cool but they are not willing to correct this problem by going back the green coolant that did not have any problems, & when the Dex-Cool eats away the intake or water pump gaskets allowing the cooling system to leak coolant & get low it will start caking up in the cooling system. Gm dexcool is not due to be serviced until every 100k, I have looked at some vehicle at 30k & the dexcool already looks really dirty, I would recommend having the cooling system completely flushed EVERY YEAR & have green coolant put in the vehicle, unless you like buying intake, head & water pump gaskets. Maybe you've already had to replace a water pump just out of warranty...
JUST CLICK ON EACH LINK BELOW TO GO DIRECTLT TO PAGE AND READ

1.) DEX-COOL - FEAR ACROSS AMERICA - BLOWN ENGINES, HEATER DAMAGE AND IT JUST GETS WORST!@!

http://www.northwestclassicautomall....?pid=49&step=2

2.) GM under Legal Fire for Dex-Cool Related Problems - Radiator, Water Pump, Head Gaskets, Sludge build up - Intentional use of Phosphates !@!

http://www.imcool.com/articles/antif...le-Excerpt.pdf

3.) GM Owners Still Steaming Over Dex-Cool -Corrosion, Engine Damage Blamed on Coolant

http://www.consumeraffairs.com/news0...m_dexcool.html

4.) Class Action Lawsuits filed

http://www.wcpo.com/wcpo/localshows/.../20299ce7.html

5.) GM, Others Sued Over Dex-Cool

http://www.noln.net/features/feature3.html

6.) Dex-Cool Extended Life Engine Coolant problems in your 'General Motors' vehicle

http://www.geocities.com/b_gillie/dexcool_problems

7.) Intake manifold gasket failure

http://townhall-talk.edmunds.com/direct/view/.ef141d7

__________FAIR BALANCED "OTHER SIDE VIEW."___________
1.) GM and Texaco “Bare All” about DEX-COOL

http://www.imcool.com/articles/antif...l-macs2001.htm

 

When you add the green stuff after the flush, add water wetter. It'll help maintain gaskets, seals, and protect against buildups.

 

what year did they start putting it in?

 

Not to question makotd, but has anyone else heard of this? I just want to have all the facts before I start some crap. I just had to replace my waterpump @ $500 and I anly have 45K on my truck.

 

SMOKE,
THAT IS TOTAL BULL****. 30K, AND THE WATER PUMP IS GONE? OUTRAGOUS!! RAISE HELL PAL!!

 

Actually it was 45k and out of warantee. I have never had this issue before in any vehicle I have ever owned. I just need to know I am right. Then I can go rip some ********!!

 

SMOKE,
THIS IS THE FIRST TIME I AM HEARING ABOUT THE DEX, BUT EVEN 45K IS TOTALY RIDICULOUS. I BET IF YOU RAISE HELL, GM WILL DO SOMETHING FOR YOU. GOOD LUCK AND LET ME KNOW WHAT HAPPENS