Antifreeze for 24 stud flathead
 

My '37 has a 99T 24 stud flathead in it. It is time to change the antifreeze in the car so all is good for winter. I have several gallons of Detroit Diesel Power Cool antifreeze left over from the last time I changed the coolant in the engines in my boat. I was wondering if this could be used in the flathead without problems.

Thanks,

Re: Antifreeze for 24 stud flathead
 

I should add that this stuff is basically ethylene glycol with supplementary coolant additives in it. According to the label it meets or exceeds Ford ESE-M97B44-A standards.

Re: Antifreeze for 24 stud flathead
 

It should be fine. It's a standard life coolant so it will need to be renewed after a time.

It's more confusing these days due to all the different formulas for long life and aluminum radiators and the like. GM orange and Ford yellow. I go for the green stuff myself unless I end up with an aluminum engine or cooling system again.

Re: Antifreeze for 24 stud flathead
 

Thanks for the info rotorwrench. I appreciate it.

Re: Antifreeze for 24 stud flathead
 

We use propylene glycol sold under the name of Sierra. It is less likely to cause damage to the engine and cooling system in the event of an internal leak. It is also less poisonous to pets around your garage. Just mix it with distilled water according to the instructions on the container.

Re: Antifreeze for 24 stud flathead
 

Where can I get Sierra? Used to get it at Tractor Supply. They don't carry it anymore.

Re: Antifreeze for 24 stud flathead
 

I have used Sierra like Supereal for years. Local NAPA is where I get mine.

Re: Antifreeze for 24 stud flathead
 

If I didn't have the Detroit Diesel antifreeze laying around in the garage, I would probably buy propylene glycol. This does two things: 1) get the stuff out of the garage an 2) save me a few bucks that I can use for something else.