Actually, they DO use anti-seize on many parts. Oxygen sensors are installed with anti-seize compounds on them. Any parts that use nickel alloys are also treated with anti-seize compounds.
Why don't they use it more? Well, its purpose is to prevent galling when using nickel bearing alloys. Since there are not a lot of nickel bearing alloys used in auto manufacture, use of anti-seize is of limited usefulness.
As to expense, the stuff simply is not that expensive as to be prohibitive for use in manufacture. While it may seem expensive to go to the store and buy a can of it, manufacturers buy their materials in bulk, and it is much less expensive that way.
Use of stainless alloys in automobiles is limited, and for good reason. Corrosion resistance is a primary reason for use of stainless, but there are disadvantages as well. Stainless is more expensive than standard non-stainless steels. Properties are another disadvantage. Stainless is softer than non-stainless steels. It does not hold an edge as well. It is prone to galling in fasteners. Lastly, stainless alloys are attacked by chlorides. Chlorides are the salts used on highways to melt snow and ice.
In this instance, there are a lot of good sound reasons for "why don't they...."
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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