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#4564116 - 11/04/17 04:58 PM Coolant for older cars
Building3 Offline

Registered: 04/30/17
Posts: 82
Loc: Michigan
I have several 1960's and 70's cars in various stages of completion. Engines have been rebuilt, cooling systems totally flushed, etc. I was wondering if I should go to the newer HOAT, or the OAT, or perhaps a universal type coolant/antifreeze rather than putting in the older green technology. Once these cars are done I would like not to change the green coolant every two years that is why the other coolants appeal to me with their 5 year change intervals. None of the cars will be driven much, just to shows and to keep things lubricated. I would say hundreds of miles a year and not thousands. Any opinions would be welcome. Thanks

#4564125 - 11/04/17 05:14 PM Re: Coolant for older cars [Re: Building3]
FlyNavyP3 Offline

Registered: 07/04/16
Posts: 1407
Loc: Jacksonville, FL
I asked the same question. The resounding answers were Deere Guard coolant or Zerex G05. No need to change, use coolant test strips.
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander

#4564151 - 11/04/17 05:40 PM Re: Coolant for older cars [Re: Building3]
Oro_O Offline

Registered: 09/20/14
Posts: 1351
Loc: Seattle-ish, WA
I looked into the same issue. G-05 is the answer.

#4564234 - 11/04/17 07:15 PM Re: Coolant for older cars [Re: Building3]
Ethan1 Offline

Registered: 12/29/14
Posts: 1632
Loc: 'murica
I've been using Peak Long Life in a 289 Ford for years because I never knew it was a dexclone and, guess what, no problems.

#4564283 - 11/04/17 08:11 PM Re: Coolant for older cars [Re: Building3]
Chris142 Online   content

Registered: 06/05/03
Posts: 16809
Loc: Deplorable in apple valley, ca
Do not use an OAT coolant in a copper radiator or heater. It will eat the solder and ruin the radiator. Our warranty is void if OAT is used in a recore or rod out.
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

#4564289 - 11/04/17 08:28 PM Re: Coolant for older cars [Re: Building3]
mechjames Offline

Registered: 01/16/08
Posts: 516
Loc: Richmond, BC, Canada
I use green and you can get test strips. It lasts longer than 2 years.
86 Mustang 5.0L 170km - Amsoil XL 5w30 / Baldwin B2-HPG
14 Ram 1500 5.7 - Amsoil XL 5w20 / Baldwin B7443
98 Jeep ZJ 5.9 - Amsoil OE 10w30 / Baldwin B34

#4564312 - 11/04/17 09:06 PM Re: Coolant for older cars [Re: Building3]
69GTX Offline

Registered: 09/23/15
Posts: 3815
Loc: Connecticut
Some of the modern green coolants have significantly reduced silicates and/or phosphates, making them not that much different than G05 in that respect.

If you stripped away your former green coolant system chemical protective layers via chemical flushes, it will take much longer to build that protection back up with a low silicate/very low phosphate formula coolant. That's possibly one advantage to sticking with a green coolant that has moderate silicates. If you pick a Zerex G05 for example it has approx 250-300 ppm silicates which will help (and less than 30 ppm phosphates).

Interesting that the Zerex green is also limited to silicates at 250 ppm. I would have thought it had more. No info on the spec sheet on phosphates.

Zerex original Green Coolant

2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs

#4564461 - 11/05/17 03:45 AM Re: Coolant for older cars [Re: Building3]
SR5 Offline

Registered: 07/07/15
Posts: 4455
Loc: Down Under
I've used Zerex G05 in older engines with success, not as old as yours, but still from back in the IAT (inorganic additive technology - silicates, phosphates, etc) days. The G05 is a hybrid coolant, so it contains both inorganic adds (for quick protection) and inorganic acids adds (for long life).

I changed my Zerex G05 every 5 years and everything looked very clean inside the radiator.
Penrite Vantage 10W40 SN & A3/B4 + Wesfil-Cooper Z154

#4564504 - 11/05/17 06:07 AM Re: Coolant for older cars [Re: Building3]
WyrTwister Offline

Registered: 01/13/13
Posts: 1487
Loc: Texas
I have used the old green coolant for years . Our 1991 Caprice has it .

Our 2015 Sonic & 2006 Lacrosse both have DexCool . Will probably stick with DexCool , in them , for now . Both , I dumped 1 gallon and added a gallon of fresh / new DexCool .`

Best of luck to you all , :-)
God bless

#4564523 - 11/05/17 06:35 AM Re: Coolant for older cars [Re: Building3]
DoubleWasp Online   content

Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
Rotella ELC. It's an OAT coolant that has an inhibitor package to protect solder, brass, copper, and a variety of mixed metals. No need to hunt it down at a specialty store or dealer. It's at WM and AAP. Also silicate free, like most ELC.

Using this in a lot of old radiators without issue.
07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio

#4564538 - 11/05/17 07:02 AM Re: Coolant for older cars [Re: DoubleWasp]
tc1446 Offline

Registered: 12/10/10
Posts: 944
Loc: Lexington, NC
Just filled my tractor with Rotella ELC 50/50....color is red.
'13 Accord EX-L 2.4L (100K) M1 & FU
'00 Ford Ranger 4.0L {65K} M1 & FU
'18 Polaris Slingshot 2.4L GM
'07 Kioti CK-30

#4564823 - 11/05/17 12:10 PM Re: Coolant for older cars [Re: Building3]
Building3 Offline

Registered: 04/30/17
Posts: 82
Loc: Michigan
Thank you very much for the quick replies. It sounds like using the older green technology with test strips or the hybrid G05 are both acceptable and easy to find anywhere.

#4565582 - 11/06/17 06:47 AM Re: Coolant for older cars [Re: Building3]
roadrunner1 Offline

Registered: 04/08/09
Posts: 1285
Loc: oh
The Deere CoolGard II is specifically designed for the applications you have described as its good for new tier 4 compliant diesel engines and also good for all of their gas/diesel legacy engines. I currently use it in over 20 engines, varying from a couple '49 Ford flatheads to new marine diesel engines. Its service life is 6 years/6,000 hrs. and can be extended with their additive.
'15 F350 6.7

#4565913 - 11/06/17 01:21 PM Re: Coolant for older cars [Re: Building3]
nthach Offline

Registered: 01/02/04
Posts: 3884
Loc: California
You can still get old school green, Zerex's formula is closer to G-05 but probably doesn't have an organic acid. Many parts stores have the old school green but in low silicate formulation to play nice with SCAs.

#4572375 - 11/13/17 04:42 AM Re: Coolant for older cars [Re: SR5]
SR5 Offline

Registered: 07/07/15
Posts: 4455
Loc: Down Under
Originally Posted By: SR5
The G05 is a hybrid coolant, so it contains both inorganic adds (for quick protection) and Organic acids (for long life).

Fixed typo from above.
Penrite Vantage 10W40 SN & A3/B4 + Wesfil-Cooper Z154

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