Cadillac STS Forum - 2005 through 2012 Discussion, How to properly do a Coolant Flush? in Past Cadillac Vehicle Discussion; I can only tell you of my experience with Dexcool. I have had Dexcool in four vehicles and used Dexcool ...
I can only tell you of my experience with Dexcool. I have had Dexcool in four vehicles and used Dexcool as a replacement coolant in my motorcycle (FJR-1300) and have never had any coolant systems problems. While seemingly there have been multiple Dexcool problems reported, out of the millions of cars that have had Dexcool installed, the number of issues is relatively small (and perhaps the correlation to Dexcool is coincident and unfounded); my last statement is jmo and conjecture on my part.
Some earlier formulations of Dexcool generated more reports of trouble than expected. Many seem related to the possibilty of contamination by air. Later formulations seem more stable. I now use it without any worry.
But all coolents are better than ever. Just don't go cheap; use a good quality coolent and change it as recommended.
I am against switching from orange to green. Stick with what your car came with. It says all over the labels to not mix the two. I honestly believe people ran into problems with DEX cool because they tried adding it to their car without first completely draining all of the green.
From personal experience, I have Dex cool in both my 05's and have had no problem with my cooling system. On the same note, I had green in my '97 mitsu and had no problems with the cooling system. My advice is to stick with what the car came with.
Checked on two sources:
One is my buddy, who works for Dealer #1, he told me they have a machine
to do a coolant flush.
The Other is: I went to a closer Cadillac Dealer #2, and the service manager
told me, they have a Machine that recircs the coolant thru the engine ?
They get $ 169.00 for a coolant flush.
Also asked about the transmission fluid replacement, they get $ 199.00,
for that, he also told me they service the local Police dept, and do service on
them every 30,000 miles,and the vehicles last longer than those who wait
the required mileage before doing certain maintenance stuff.
My owners manual says to wait 100,000 for transmission fluid change.
I am going to get it changed @ 50,000.
Testing: Castrol EDGE, 5W-30 and the M1 oil filter, with anti-drainback
valve. Feel a lot better knowing I won't be doing Dry Start, Startups !
I would not be real concerned putting a machine on a cooling system but the old-fashioned methods of reverse flushing with a hose is likely just as good as any machine. (Just make sure to get it up to operating temperature a few times with the heat on maximum to flush the heater core.)
I would be VERY HESITANT to put a machine on my STS transmission. More than half the time, the last transmission serviced on that machine had a worn out or failing transmission and that flush was a 'last resort' before a rebuild. Our cars have very intricate transmissions assembled in 'clean room' conditions. I would want assurances that the flushing machine was completely clean and a guarantee before I'd even consider doing so. What is the shop manual's procedure?
Besides, transmission fluid (hydraulic oil with specialized additives) doesn't get exposed to combustion or dirt like engine oil. If the car is well treated, it doesn't even get all that hot. Unless I find reason to believe it needs early service, I'm waiting to 100,000 miles as stated in the manual.