INEOS CAMPAIGN: trailing arm bolts being monitored

[OkGo]

i guess these are the kind of marks you have in mind ? The red ones..

 

[TheDocAUS]

They allow a visual check to ensure any bolt is in its proper place. If the lines diverge, tighten the bolt.

 

[OkGo]

Yup used them for decades at this point in various spots. But have never known a dealer to add these ad-hoc. Which seemed like you were saying was done to your car? Mine seem to have these marks all over the place.