They may not loosen but they can stretch also. It's a good practice check all important torques periodically. (lug nuts, suspension bolts, pin box, etc.)
Even hitch mounts can loosen from stress after a time. I live near the ocean so mine rust in place ..... Rust: Mother Nature's Lock Tight.
Replacing with grade #8 bolts will stop from stretching but require higher torque. JM2¢, Hank
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD .. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite
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