What is an advantage of lubricating aluminum bolts before installation?

Lubricating aluminum bolts before installation is beneficial because it helps achieve accurate torque readings during the tightening process. When bolts are tightened, friction can create variations in the amount of torque applied. By applying lubrication, the friction between the bolt threads and the nut or hole is reduced, allowing for a more consistent and accurate torque to be applied. This ensures that the bolt is sufficiently tightened without being over-torqued, which can lead to damage or failure.

In contrast, the other options do not provide the same practical benefits. Making bolts easier to paint or beautifying them is not a functional advantage related to their performance in mechanical applications. While lubrication can help with oxidation prevention to some extent, this is not its primary purpose and may not be significant in comparison to the primary function of facilitating accurate torque application. Overall, the lubrication mainly enhances the effectiveness and reliability of the installation process.