National Geographic : 1942 Oct
IFYOU SAVED YOUR \ , LAST WINTER'S ANTI-FREEZE... Some of the ingredients of "Prestone" anti freeze will last from one winter through the next-those, for example, which protect the car against freeze-up. But to give protection against freeze-up is only one function of a good anti-freeze. A good anti-freeze also per forms other functions, just as important. One of these is to guard against rust and corro sion... which is why all good anti-freezes are "inhibited." These inhibitors do wear out; and when that happens the car is no longer protected against clogging and over heating caused by rust. That is one of the reasons why you can not use an anti-freeze indefinitely ... why, for instance, we guarantee "Prestone" anti freeze for "a full winter's use," and no more. New, fresh anti-freeze is always to be pre ferred over anti-freeze which has gone beyond a single winter's driving. If, however, you decide to re-use your anti freeze, take the following precautions: If you stored your anti-freeze during the summer, take it to your dealer before putting it back in the car. There are 2 good reasons. A To make sure that no dirt or foreign matter has spoiled it. (Cans frequent ly rust through from the outside and from the bottom. Dirt and foreign matter will clog your cooling system badly.) If your solution is brown or rusty-looking, don't bother to take it to your dealer but discard it at once. Be extremely cautious in this re gard. Your car is a valuable property: it is in the interest of sound conservation to take all reasonable precautions. 3 To have the strength checked...You don't know, definitely, what concen tration you had at the end of the season. If your anti-freeze was "alcohol base," you almost certainly lost strength before you took it out last spring. Even if you used "Prestone" anti-freeze, which contains no boil-away alcohol, have the strength checked just the same. You may have lost protection through careless filling, slop-over at the over-flow pipe, and leaks caused by road shock and wear-and-tear during driving. Syou left your anti-freeze in your car, and have been driving with it all through the summer, point B (above) is even more important, for obvious reasons. These precautions are the very least you can take to protect your car. Remember, none of them will put back into the anti freeze the rust and corrosion inhibitors which were there when you bought it last fall, and which have since been used up. This is one of the sound technical reasons why manufacturers guarantee anti-freeze for only one winter's driving.