Mercedes R107 - expansion tank. Why they go yellow and how to clean them.

This is a detailed video showing how to clean the tank or expansion tank on a 1975, R107 Mercedes 280 SL. The video explains the different reasons why these tanks become discoloured and shows the different processes for cleaning the discolouration.
The degree to which you will be able to clean your tank, depends on why it is discoloured - e.g. rusty water, oil deposits, thermal degradation, etc
We sent this header tank off to Sonic Solutions who are one of the leading industrial cleaning companies in the UK. They were kind enough to email us a short video clip which is included in the video.

[@ronalddean3630]

Wow, it is like being in a college Science class! This was awesome!

[@MikesMercsandothercars]

Thanks…yes there is so much to learn about these cars. Mike

[@hdchemicals5443]

We are happy to see that you choose our product for your job.

[@iz1885]

Professional and scientific explanation. 👍👍

[@MikesMercsandothercars]

Thanks for your comment. Mike

[@Nilfaultfound22]

Hi Mike. We made it back, but no sign of the car. They are saying the radiator repair will take a little longer than expected. Anyway we are heading up country tomorrow but will be back in Bristol at the end of the month. I’ll keep in touch.

[@MikesMercsandothercars]

Ok. If you get stuck, I can put you in touch with repair people in Bristol. I got the impression they were pretty busy. Mike

[@Horus845]

I was wondering if you could find transparent white spray paint and paint over it, it might work , I think frosted white spray paint will work but I would clear coat over it , going to try it out myself . Great video .

[@MikesMercsandothercars]

Ideally, you need top be able to see through the plastic of the header tank to be able to see whether your coolant is at the right level. If you paint and clear coat it that might limit your ability to see through the plastic. Mike

[@rstezza]

Clickbait thumb nail👎👎👎

[@MikesMercsandothercars]

Thanks for your comment. You are right, not everyone notices the question mark (?) in the title which makes it appear a bit 'click baity'. This video is a response to the "How To Clean & Restore Coolant Tank - PERMANENTLY" which has 7.2million views and purports to be able to restore a coolant tank to new looking. My video makes it clear (no pun intended) that it is not possible to restore aged plastic with the method shown in that video. Mike

[@dammivithana4516]

🐍🐍🐍🐍🐍🐍

[@MikesMercsandothercars]

Is the snake emoji a good thing or a bad thing? Mike