I contacted Waxoyl AG.

She supports my Mercedes-Benz Owner's Manual that is against postproduction rustproof treatment.

A shop owner in the UK who has been applying Waxoyl for tens of years expressed the same opinion.



My MB manual:

"Your vehicle has been treated at the factory with a waxe-based
rustproofing in the body cavities which will last for the lifetime of
the vehicle. Postproduction treatment is neither necessary nor
recommended by Mercedes-Benz because of the possibility of
incompatibility between materials used in the production process and
other applied later."

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

I agree with that completely. Other problems with using aftermarket coatings is the difficulty removing any oxygen/moisture before applying the coating. If it's not done properly you will trap these components and it will result in oxidation underneath the supposed protection.

The coating MB applied to vehicles years ago was cosmoline. If you still have it on your engine and undercarriage it will most likely be very difficult to remove with any typical cleaners. It is best to leave it on the undercarriage unless you plan on showing the vehicle. Same goes for the engine. Personally I can't stand it due to the nasty yellow color it has and I've removed it from many parts of the engine bay.

Unfortunately winter use of any automobile will accelerate wear/tear and corrosion of components. You can slow the process by cleaning the vehicle regularly but eventually the inevitable will happen. Only thing you can do is monitor the vehicle and stop corrosion as soon as you see any signs of it. It will require annual inspections/repairs after each winter to keep the car up.

__________________
Afshin

Current:
02 C32 AMG

Previous:
92 500E
84 190E 2.3 5 Spd

Waxoyl is a great product, we no longer use it because no one wants to spend extra money on rust proofing anymore but I used it all the time.

Its the first rust proofing we found that's not some thick top coat but actually more of a liquid wax. You could spray it inside pannels and not worry about plugging drain holes and fouling window parts. We were also told it would lube window tracts and not dry out.

Most if not all car companys say no to rust proofing because so many caused more damage then they were worth but Waxoyl was one product that we never had trouble with and all of my collection has been treated.

I heard two opposite opinions on applyaing Waxoyl on MB. Both people own shop applying Waxoyl on automobiles.

One person said that there is nothing to worry about compatibility.

The other person said that Waxoyl will make the Mercedes factory wax "pancake
off".

By the way, do you have experience with Fluid Film?

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