You are here:

Classic/Antique Car Repair/Best Coolant for 1939 Buick


I have a 1939 Buick

New radiator, rebuilt engine, 160 Degree Thermostat. Using 50/50 mix of water and conventional antifreeze

Engine settles at 185-190 degrees - seems high

What is the best coolant for a car from this era?

The 160 is the recomended one for that engine. I would use the green prestone or any of the plain general purpose perminent anti freezes. I would not be concerbered with temperature readings that you have as long as you are running the 50/50 MIX as its boiling point is 245 and if you are running a pressure radiator cap the boing point is about 300degrees.

Classic/Antique Car Repair

All Answers

Answers by Expert:

Ask Experts


Brad Sears


All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.


Automotive tech instructor. Syndicated auto columnist 1970's though the early 1990's. Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's TV Show "Last Chance Garage" 1980's PBS-TV syndicated. Auto instructor for the following companies: Fram Autolyte Holly Carter AMF Ford Motor University Of Conn Blue Hills Technical School Sugar River Technical Center Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.

Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.

More than I care to remember. Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.

Awards and Honors
Moto Award winner. And much more.

©2017 All rights reserved.