Bought it new and after 5 years (75K) I feel it's time to flush and renew the cooling system. It's been treated well it's whole life and I only use synthetic fluids throughout. Most of the miles are highway. My questions are these:
Do I need to do this at all if the coolant in the puke tank looks good?
Do I go back with DexCool or Universal or something else?
Does the over-the-counter flush solution do the trick or is there a better option?
Any suggestions are welcome. Never did this on a (relatively) new vehicle.
TIA,
Chuck.

__________________
1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".

you'll want to use the dexcool. if any of the old stuff is left behind it will make a hell of a mess with regular green coolant. Have a good look at the intake manifold gaskets and see if they are leaking. GM has a real problem in that area and could cause coolant to leak into the crankcase and destroy the bottom end.

X2 on using only Dexcool. When I did the Suburban two years ago, I did the soap/citric acid flush before refilling it with Dex. At 75K you should still be OK as Dex is supposed to last 100,000 miles.

__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad