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Old 02-14-2011, 12:59 PM   #1 (permalink)
hunz
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what antifreeze to use in the 6.5

ok guys so this may be a dumb question, but what color antifreeze do i use in my 94 6.5l? I know a fella who used the regular old green antifreeze in a 30' GMC diesel box truck and the engine locked up because they apparently were supposed to use the red antifreeze. I am just curious if the 6.5 requires the red antifreeze or just the ole walmart green stuff?
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Old 02-14-2011, 01:35 PM   #2 (permalink)
vdb11
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Ha I am not completely sure, I use the green stuff. I believe to use the GM Dexcool you need to flush everything, I like the green/premixed stuff, but I am no expert. I am sure someone will have a better answer
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Old 02-14-2011, 01:40 PM   #3 (permalink)
gnel
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I use the regular ole green.
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Old 02-14-2011, 04:27 PM   #4 (permalink)
4doorTAHOE6.5TD
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DEXCOOL is the best for all the parts it is in contact with. I have 96 6.5 that has the original OEM fill. About 180K now. Very little change of color Thermostats is the only parts changed. Add a few ounces occasionally @ the coolant reservoir. FYI ,GM was going to declare DEX as good for the life of the vehicle @ one point. Maybe the legal problems with the S10 changed there mind.I wouldn't use green it if given to me!!! JMO
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Old 02-14-2011, 06:26 PM   #5 (permalink)
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With all do respect to 4doorTAHOE6.5TD, Dexcool has not been invented in 1994 which is the truck year.

So, your 1994 model year is probably using regular green.
Dexcool does not start till late 96 model.

My suggestion is to use the regular green. Dexcool has had a lot of trouble over the years when you have air in the cooling system. Plus you don't want to mix the green and Dexcool together without proper flushing which is not easy to do with around 6 gallons of coolant.
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Old 02-14-2011, 06:31 PM   #6 (permalink)
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Thanks fellas, I always know where to come to find my answers. The members on this forum cease to amaze me
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Old 02-14-2011, 06:37 PM   #7 (permalink)
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I continue to use Dexcool. It came with the truck, but I have changed it twice so far.

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Old 02-14-2011, 06:53 PM   #8 (permalink)
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If you want to change from Dexcool (The pink stuff) To another type anti freeze you must drain the coolant, Fill with clean H20, Run the engine. Drain & flush completly out. Then fill with the coolant mix of your choice. Adding other coolants to Dexcool without getting it completly out of the system. Can cause it to gell up, harden and block the radiator and other cooloant passages.

That being said I use Dexcool in my truck. It came with it so why change. It only cost a little more than other coolants. A quick drain, flush, and fill and i am good to go for another 50000 miles.
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Old 02-14-2011, 07:00 PM   #9 (permalink)
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I flushed the Dexcool crap out of my 96. I'm running the regular green in both rigs now. I wouldn't use Dex if i was paid to after it caused my t-stats to stick open since they were all gummed up.

Don't get me wrong. Dexcool when used properly is fine. It's when anything else is added that it turns to crud.

All that was added to mine was tap water, and it still started to gel up.

Seems you can only use distilled water.

i'm not a fan of Dex, at all. Anything i own, or that i service that runs Dex gets a flush and green coolant put in place of the Dexcool.
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Old 02-14-2011, 07:19 PM   #10 (permalink)
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You should never add tap water to any cooling system. Distilled is the only way to go.
Even with other comercial coolants green pink, red,blue, purple or whatever . If the water is hard, the calicum carbonate, iron, and other disolved elements. Over time will evenually stick to the radiator tubes clogging them up reducing the efficency of the radiator. Not good for a 6.5.
Distilled water is best for a long lasting cooling system no mater what the coolant used.
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Earth First!!! We will mine the rest of the planets later.

1998 GMC K1500 6.5 66000 miles. Auto, 3.73 gears.
Remote PMD mounted on the radiator support
KOJO tune WOW !
Carter HD lift pump. Feed the beast
K&N filter
Ported, gasket matched upper intake.
New Bosch injectors. flow matched 2200 lbs pop
3 1/2" custom Aero turbine exhaust. Nutered Cat
2" Lift RS5000 Shocks. 285 X 17 BFG AT summer tires.
12.50 x 33 x 15 Procomp MTswinter. Powertrax No slip locker in rear.

Last edited by Tommygunner; 02-14-2011 at 07:20 PM.
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