One DIY I read says to use loctite on the rotor->hub hex bolts. Other says no loctite.

Unless there is a pressing reason not to do so, I would be inclined toward using blue loctite?

Correct?

Thx

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

Did the old bolts have blue on them? IIRC they came from the factory with blue. I used blue when I changed rotors on my w123 when I had one.

I'll tell you when I take them off

I am getting ready to do the job, never having done so, and I am trying to cover some questions that arose when reading the DIYs....

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

Blue threadlocker on rotor bolts cannot possibly be a bad thing.

I won't use that stuff on anything. I want things to come apart and not fall apart but I haven't seen that happen yet in the 35 years I've worked on these old cars.

Then it is understandable that you are not aware that non-permanent threadlocker like Loctite 242 is specifically formulated for applications that require disassembly.

Blue is you want to remove it, eventually

Red if you want to hate yourself

Or be known as the #@$#@! PO by whatever poor sap happens to do the job next time

I never use it for brakes. I do at least 3 brake jobs a day.
I rely on clean threads and correct torque to make sure nothing falls off.

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I choose to be happy, even when the Mercedes is being awkward, lol

^2

Some cars don't even have them.

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Jim

The rotors from the benz factory comewith locktite so I use it on them too. Red.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Proper torque is important. Threadlocker helps ensure that proper torque is maintained. It's tough to make an intelligent argument against its use.

I use the blue stuff.

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83 SD

84 CD

Doesn't matter what color the loctite is. A little heat (500F) will make it soft as butter.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Subaru doesn't use thread locker on any of the brake components.

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I choose to be happy, even when the Mercedes is being awkward, lol