can anyone tell me what is the common type and quantity of radiator coolant for my 1963 with a 390ci 

I have a standard copper radiator 

Views: 73

Reply to This

Replies to This Discussion

I've used regular Prestone anti-freeze & coolant all my life in all cars including my 64 CDV.

Prestone and Zerex were two brands around forever back in the day
They are a one year replacement coolant
I went with a Walmart brand good for 5 years ( a blue bottle ) --Super Tech
Should reduce my maintenance schedual some


Flush the cooling system with clean water
When complete you will have two gallons of clean water in the engine block
You want to add- two gallons of coolant ( Non deluted coolant ) to what you have in the engine for the 50/50 mix you want to arrive at
That will protect you in the colder climates
Use a coolant tester ( with the balls that float ) to check the temp you are protected to from freezing
The coolant brakes down over time so do the proper coolant changes on time to keep all protected from freezing and internal rusting and scaling
The coolant does not disapate heat as well once it wears out from age


You want the engine to be running during the flush and installing the new coolant
Run the car for a while and top off the rad
You want to add a water pump lube and coolant sealer with the new coolant per the manual

Its not so easy just to recommend a product. Prestone used to be the choice. But Prestone has changed the formula and added acid to make it long-life. So what matters is that you buy a coolant that is acid-free ethylene glycol. Check MSDS.

There is some more information in Recommended Coolant

If you really would like some extra knowledge/opinion check:

Prestone and other long life coolants ruin RR Engines

 You can spend weeks researching coolants, and find any angle you like on the subject but I cannot find anything that substantiates that Prestone and others have suddenly started dumping any significant amount of acid in their coolants, in fact I find the opposite, in that most modern coolants have inhibitors that work to prevent the coolants from breaking down in to acid. Anders, I checked your link to the article about the Rolls Royce engine and see it is 7 years old and the technical article it points to is 10+ years old. Again, you can find someone arguing this or that about any particular subject of interest.  

The thing you have to remember is that all coolants start to break down and become acidic in time, European countries often have different coolant specs and formulas due to hardness of water and some tap water will have minerals, etc. that could in extreme cases become harmful so distilled water is generally recommended, especially where you have hard tap water.  

With that said, I think the main thing is to change out your coolant every 2 years per the Shop Manual and Owners manual to prevent acidity and breakdown of the inhibitors, and if you are in the United States I believe any of these Ethylene Glycol based antifreezes references in the O'Reilly Chart would be fine:
O'Reilly Antifreeze Reference Chart 

If you are in Europe I would look for comparative charts for what your auto retail stores provide.



  • Add Photos
  • View All


Photo posting appears to be broken

Started by Kevin Campbell in General Discussion 7 minutes ago. 0 Replies

Hey Jason,It would seem, the photo posting bit could do with a tickle on the bottom to get some action happening. I understand, you're probably still making like a friggin gopher in one of your…Continue

Where to get brake booster and master cylinder rebuilt

Started by Chris Gill in 1963/64 Cadillac Specific Discussion. Last reply by Kevin Campbell 22 minutes ago. 1 Reply

Hi folks,I'm new to Cadillacs so bear with me if this question has already been answered but I did a search of the forum and couldn't find an answer.It appears I have an original master cylinder…Continue

1964 Cadillac Coupe for sale

Started by Hank Johnston in For Sale. Last reply by Kevin Campbell 57 minutes ago. 4 Replies

Hi fellas, regretfully I am trying to sell my 1964 Cadillac Coupe deville. I've had it almost 4 years now and am having to face facts that I just dont have the time or money to do what I want with…Continue

Question: comfortable highway speed?

Started by Mark Geertsma in General Discussion. Last reply by Jeff Kinzler 13 hours ago. 19 Replies

What is your preferred cruising speed on highways with your classic Cadillac? What I mean is the speed that allows for relatively quiet and comfortable cruising without slowing down other traffic.…Continue

Tags: speed, Highway

Blog Posts


Posted by Mike Petrey on January 13, 2019 at 12:25pm 7 Comments

Where do the flashers go in my 64 Deville Convert.  I'm thinking that's why both turn signals stopped working.

Source for Motor mounts and Trans mounts 1964 SDV

Posted by Norman Silverman on January 9, 2019 at 4:23pm 2 Comments


Where is the best place to purchase good quality motor mounts/trans mounts for my 1964 SDV? I see that Rock Auto has them for $8 and change, and others for $24 and change. Big difference. Is there a better place to buy them from?



Fuel loss in Carburetor

Posted by Ian Osborne on December 29, 2018 at 11:24pm 16 Comments

Lately if I haven't started my '63 in four or five days it seems that the carburetor has gone dry. The starter cranks for an extended period of time and the engine doesn't come close to firing. I have resorted to pouring a little fuel into the carb to save the starter and battery. This gets it started and it runs fine. It also starts fine after sitting a short while - a couple hours or so.

The fuel pump is new and there is always fuel in the glass bowl of the fuel filter. This, along…



Posted by John Rueff on December 19, 2018 at 4:24pm 3 Comments

I would like to upholster my caddy back to original.   Does anyone know where I can look at some pictures or photos.  Also, how hard is it to remove the dash?  thanks


  • Add Videos
  • View All

© 2019   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service