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Coolant upgrade for 76 Oldsmobile? #5129676
06/09/19 08:15 PM
06/09/19 08:15 PM
Joined: Dec 2005
Posts: 1,000
Ontario Canada
caprice_2nv Offline OP
caprice_2nv  Offline OP

Joined: Dec 2005
Posts: 1,000
Ontario Canada
I'm due to flush the cooling system again on my 84 Oldsmobile with a 76 350 engine. It still has green coolant in it, but I'm wondering if there is any reason not to put dexcool or some other long life coolant in it? I wouldn't mind spending a little extra if it might last longer or have any other benefits.


84 Olds Cutlass - 350 Olds
83 Chevy Caprice - 305 Sbc
79 Honda CX500
Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5129681
06/09/19 08:24 PM
06/09/19 08:24 PM
Joined: May 2010
Posts: 10,253
out there
spasm3 Offline
spasm3  Offline

Joined: May 2010
Posts: 10,253
out there
Maybe G-05, but i'd not put dex-cool in it if it has original gaskets, especially the head gaskets. Green is safest for it.

Last edited by spasm3; 06/09/19 08:24 PM.

13 elantra 78k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 12300 miles m1 0w30
Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5129692
06/09/19 08:35 PM
06/09/19 08:35 PM
Joined: Jun 2003
Posts: 19,178
Apple Valley, California
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 19,178
Apple Valley, California
Dexcool or any long life coolant will eat the solder out of the radiator and heater. likely the intake and head gaskets too.


02 Wrangler traveler sae30
87 F250 Valvoline 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor Chevron sae30
Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5129704
06/09/19 08:40 PM
06/09/19 08:40 PM
Joined: Apr 2010
Posts: 1,720
Suburban Washington DC
atikovi Offline
atikovi  Offline

Joined: Apr 2010
Posts: 1,720
Suburban Washington DC
I used this in a 92 Eighty-Eight. Extended life and green for an original look.

[Linked Image]

Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5129708
06/09/19 08:43 PM
06/09/19 08:43 PM
Joined: Sep 2011
Posts: 124
Oklahoma
65f100 Offline
65f100  Offline

Joined: Sep 2011
Posts: 124
Oklahoma
Zerex Original Green claims a 5 years service life and would be completely compatible with your system.

Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5129732
06/09/19 09:11 PM
06/09/19 09:11 PM
Joined: Oct 2005
Posts: 4,589
Kansas
Kruse Offline
Kruse  Offline

Joined: Oct 2005
Posts: 4,589
Kansas
If it was mine, I'd just use the original green, still available at farm supply stores and some auto supply stores.
Or, if you've got a few more dollars to spend, buy some John Deere Cool Guard.

Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5129748
06/09/19 09:26 PM
06/09/19 09:26 PM
Joined: Jun 2002
Posts: 13,132
The Motor City
Kestas Online content
Global Moderator
Kestas  Online Content
Global Moderator

Joined: Jun 2002
Posts: 13,132
The Motor City
Does your car have a soldered copper/brass radiator and heater core? If so, I vote for Zerex Original Green.

Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5129788
06/09/19 10:08 PM
06/09/19 10:08 PM
Joined: Dec 2002
Posts: 42,971
New Jersey
JHZR2 Offline
Global Moderator
JHZR2  Offline
Global Moderator

Joined: Dec 2002
Posts: 42,971
New Jersey
Green, which is different than what was sold years back; G-05; or John Deere Cool Gard II.

You do need to know what sort of brass/copper soldered stuff you have in that vehicle...

Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5129884
06/10/19 02:56 AM
06/10/19 02:56 AM
Joined: Oct 2015
Posts: 3,084
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline

Joined: Oct 2015
Posts: 3,084
Balearic Islands , Spain
I would use Zerex Original Green.

What's cool about it is that it's actually not a IAT formula.

It's a coolant developed by Glysantin which is sold by Glysantin and also Comma in Europe as "G64" originally for Volvo trucks i believe, it's what they call a PSi-OAT ( Phosphate + Silicate + OAT ) i am quite sure it does not have 2-Eha so it will not corrode solder.

Last edited by FordCapriDriver; 06/10/19 02:57 AM.

1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.
1988 Ford Escort XR3i Cabrio, - Shell Rimula R4X 15W-40
G40 Si-OAT coolant in both


Re: Coolant upgrade for 76 Oldsmobile? [Re: JHZR2] #5129936
06/10/19 05:52 AM
06/10/19 05:52 AM
Joined: Dec 2009
Posts: 27,760
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline

Joined: Dec 2009
Posts: 27,760
Regina, Saskatchewan, Canada
Originally Posted by JHZR2
Green, which is different than what was sold years back; G-05; or John Deere Cool Gard II.

You may have to settle for JHZR2's suggestion given the difficulty in obtaining original green these days in Canada. I haven't seen a jug at a supplier for years, with the last being at Partsource. I believe Oil Mart markets a conventional green at a good price, but I'm not sure how close you are to one.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5129947
06/10/19 06:08 AM
06/10/19 06:08 AM
Joined: Dec 2005
Posts: 1,000
Ontario Canada
caprice_2nv Offline OP
caprice_2nv  Offline OP

Joined: Dec 2005
Posts: 1,000
Ontario Canada
Sorry, I left out a couple of things...it's a newer aluminum radiator. A newer heater core (also aluminum). Original steel shim head gaskets.

Intake gaskets are fel pro recently replaced because of some minor pitting on the Edelbrock aluminum intake manifold.

Last edited by caprice_2nv; 06/10/19 06:10 AM.

84 Olds Cutlass - 350 Olds
83 Chevy Caprice - 305 Sbc
79 Honda CX500
Re: Coolant upgrade for 76 Oldsmobile? [Re: Chris142] #5129948
06/10/19 06:13 AM
06/10/19 06:13 AM
Joined: Apr 2010
Posts: 1,720
Suburban Washington DC
atikovi Offline
atikovi  Offline

Joined: Apr 2010
Posts: 1,720
Suburban Washington DC
Originally Posted by Chris142
Dexcool or any long life coolant will eat the solder out of the radiator and heater. likely the intake and head gaskets too.


Do you have any links that support that?

Re: Coolant upgrade for 76 Oldsmobile? [Re: Garak] #5129958
06/10/19 06:33 AM
06/10/19 06:33 AM
Joined: Dec 2005
Posts: 1,000
Ontario Canada
caprice_2nv Offline OP
caprice_2nv  Offline OP

Joined: Dec 2005
Posts: 1,000
Ontario Canada
Originally Posted by Garak
Originally Posted by JHZR2
Green, which is different than what was sold years back; G-05; or John Deere Cool Gard II.

You may have to settle for JHZR2's suggestion given the difficulty in obtaining original green these days in Canada. I haven't seen a jug at a supplier for years, with the last being at Partsource. I believe Oil Mart markets a conventional green at a good price, but I'm not sure how close you are to one.


I can easily go to a John Deere supplier around here. I appreciate that advice.

The last time I bought green coolant it seemed like they only carried the bottom of the line cheapest stuff in green (certified brand at Canadian tire I think). I don't really want to cheap out on fluids in a 35 year old car that I might drive daily another 20 years. The past 12 years went by extremely fast and I've had to replace the heater core twice and have the rad welded (the rad was 15+ years old). The rad repair guy told us to install a ground strap because there was electrolysis happening inside.


84 Olds Cutlass - 350 Olds
83 Chevy Caprice - 305 Sbc
79 Honda CX500
Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5129974
06/10/19 07:26 AM
06/10/19 07:26 AM
Joined: Dec 2009
Posts: 27,760
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline

Joined: Dec 2009
Posts: 27,760
Regina, Saskatchewan, Canada
Yes, and Canadian Tire doesn't even carry it anymore. The last I saw on the shelf was Texaco stuff at Partsource. Perhaps a Partsource in your neck of the woods may still have it. I don't think even Rechochem is making original green these days, and they make up whatever a company wants, plus a bunch of jobber stuff.

The other option would be a Chevron lubricant distributor (Husky/Mohawk handles that out west), if you can find one, since there still is a Havoline branded conventional green listed on the Chevron site. I can't say for out there, but here, a number of trucking outfits carry a lot of Chevron products, and one may be able to do a special order. Given the coolant capacity of vehicles like yours, it's probably not outrageous to buy a box of four jugs.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: Coolant upgrade for 76 Oldsmobile? [Re: caprice_2nv] #5130014
06/10/19 08:27 AM
06/10/19 08:27 AM
Joined: Aug 2015
Posts: 3,274
NC
BigD1 Offline
BigD1  Offline

Joined: Aug 2015
Posts: 3,274
NC
Pretty sure Dexcool has been re-formulated multiple times over the years, but there is no way I would ever trust it in an old car. My 98 Malibu that I bought brand new looked like the pictures from San Carlos Radiator linked below.

Select photo album Dexcool.

http://www.sancarlosradiator.com/photo_gallery.htm


1992 Toyota Pickup--Quaker State Advanced Durability 10W-30--Motorcraft 910S
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