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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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