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PostPosted: Wed Jan 23, 2013 11:26 pm 
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Year and Trim: 2003 Pontiac Bonneville
I just bought a 2003 pontiac Bonneville sle today. so far i love it.

I had a cadillac and the dex cool killed the head gaskets, I am wondering if I should flush the coolant with something else.

Also any other maintenace that I should do?
the car has 130K miles


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PostPosted: Thu Jan 24, 2013 11:02 am 
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Location: Midland, Michigan
Year and Trim: 2002 SE
Change your lower intake gaskets with the updated, either the steel or aluminum framed ones will work fine. Also change out the upper intake manifold with an updated version to stop the issues with the EGR stovepipe and coolant leaks. While doing those jobs replace the coolant elbows with Dormans new aluminum set and then with that all done the car should give you many years of trouble free driving as far as the engine is concerned.

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PostPosted: Fri Jan 25, 2013 12:09 am 
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Year and Trim: 2003 Pontiac Bonneville
should i keep dex in it?


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PostPosted: Fri Jan 25, 2013 12:27 am 
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The original dex that is in it I would flush out. From there, if you do a really good thorough flush you can refill it with any coolant you want. I used the good old green stuff in my '03 SSEi, but if you really want to you can go with the new Dex Cool as it has been reformulated and is safer to use now / shouldn't cause issues.

I use the green stuff because it works, is cheaper, and is available basically anywhere if I should happen to need some in a pinch.

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Check out my detailing page on facebook! --> Next Level Detailing
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2003 Bonneville SSEi - The Black Mirror SOLD!
2002 Bonneville SE - The Mutt Complete 2004 SLE interior, drivetrain, and body harness swap, ECC swap, HUD swap, black GXP wheels, GXP headlights and tinted tails - SOLD
2003 BMW 540i M Sport, 2001 BMW X5 4.4i, 2010 GMC Acadia, 2017 Grand Design Imagine 3150BH
1982 Cutlass Supreme - The fun one

MattStrike wrote:
It was the worst week of my life! *pause, drinks beer... smiles* But I'm better now!


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PostPosted: Fri Jan 25, 2013 1:12 am 
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If you upgrade to the Aluminum gaskets and the sleeved UIM, dex should be fine to use. Just make sure you flush the system really well, since Dex doesn't mix with traditional coolant, even though most of the stuff on the market now is a "mixes with any" style.

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