Coolant Change - SLK55, old green compatible with new blue? - Mercedes Benz SLK Forum

SLK R171 General Discussion SLK 200, SLK 280, SLK 300, SLK 350, SLK 55 AMG

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#1 Old 1 Week Ago
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Coolant Change - SLK55, old green compatible with new blue?

Hi all, used the search and couldn’t find what I was looking for...

In the process of doing a coolant change. I have a 06’ SLK55. The current coolant is original (I think), bright thickish neon green in color. I went and bought OEM Mercedes coolant, they said the new stuff I should use is blue.

So, questions;
- Is the old green compatible with blue?
- Is the blue stuff correct for this car?
- Was the green the original for this car?

Thanks!
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#2 Old 1 Week Ago
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All coolant, no matter the color, should be equal
My 09 had green when new. When I got my Supercharger in 2016, blue was the replacement.


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#3 Old 1 Week Ago
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looks blue to me


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Jeff, US Army Master Sergeant Retired
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#4 Old 1 Week Ago
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Did you do a complete flush or just drain the tank (not the block)?
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Quote:
Originally Posted by calpolydm View Post
Did you do a complete flush or just drain the tank (not the block)?
They, not I did it and was a flush plus of course the intercooler has its own radiator per se and recovery tank

here is whole sc thread:

https://www.slkworld.com/performance...er-thread.html


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Ok, thanks. Trying to understand if I can do a drain and then refill with blue or if I have to do a full flush to get every last bit of green out before I go blue.
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#7 Old 1 Week Ago
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Quote:
Originally Posted by calpolydm View Post
Ok, thanks. Trying to understand if I can do a drain and then refill with blue or if I have to do a full flush to get every last bit of green out before I go blue.
don't know if i covered this with you and if you replied and said your coolant was 'weak' but coolant not usually changed until 150000 miles or 15 years.


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#8 Old 1 Week Ago
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Yeah, the inspection said is was weak.
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You need 326.6 MB coolant approval
https://bevo.mercedes-benz.com/bevolisten/326.6_en.html

Remote installation of Passthru, C4 DAS/Star Mercedes, XENTRY,EPC/WIS
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