I used to smear my wheel bolt thread and cone with copper type lube, but they really should be used 'dry' to torque correctly. Use a torque wrench at 75-80ftlb. It's not as tight as you might expect. Most tyre depots over-tighten them, especially when using an air tool for tightening. And completely 'dry' bolts do tend to get stuck over time. Perhaps a slacken and re-torque plan should be included in the annual service.
TC
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