I usually retighten wheel bolts with torque wrench after rotating tires, because the manual recommends it 60~300 miles after re-attaching wheels. When I retighten the them, only a couple of the 20 bolts rotate small amount.

At this DIY tire rotation, however, I sprayed WD-40 on wheel bolts – the bolts looked brown due to rust -. When I retighten the bolts, I found that almost all the 20 bolts rotate more than usual.

Did I do wrong thing? Must I degrease the wheel bolts for driving safety?

My car is 1992 300D, 263 thousand miles, with factory alu-alloy wheels.

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.