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Originally Posted by Need_for_speed
I've searched this forum and others for guidance on how to properly use anti-seize, but I'm still a little confused and hope the collective wisdom here can help me clear things up. My understanding is that anti-seize should be used whenever we join two dissimilar metals, like aluminum and steel -- for example, aluminum brake calipers and steel caliper bolts. I also understand that anti-seize should be used whenever rust or corrosion is a potential issue.
However, what is the effect of anti-seize on torque values? I've seen recommendations that torque values should be reduced by as much as 30 percent when anti-seize is used on fasteners. Does Porsche recommend the use of anti-seize on various fasteners, and if so, do their torque values take this into account?
I'm getting ready to do some exhaust work, and want to make sure I'm fastening everything up per factory spec. Appreciate any insight.
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If you read the white paper published by ARP, the bolt people, the accuracy of applied torque can become quite inaccurate towards the low side due to friction if some type of lubricant is not applied to the fastener in question. Most astute engine builders use something like ARP's Ultra Torque lubricant specifically for this reason. In my shop, we use various types of antiseize and apply the factory torque specs. The anti seize will function as a lubricant during the process and actually help you achieve the correct torque. If you are working on the exhaust, consider using a high temperature anti seize made from nickel, which works very well in this application.