Have a look:
https://eurol.com/en/introducing-the-eurol-additives-range-q...

https://eurol.com/en/products/

However, "S" is probably some kind of internal code and immaterial to the translation. Personally, I would not worry too much about it.

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Note added at 45 mins (2019-06-04 12:42:25 GMT)
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https://eurol.com/en/about-eurol/history/

https://eurol.com/en/eurol-specialty-lubricants/
Perhaps the "S" refers to the "specialty" range of products (?)

https://www.eurolspecialty.com/en and https://www.eurolspecialty.com/en/products
specialty lubricants
Home>Products>Products A-Z
Products A-Z
Products A-Z
Chain lubricants
Gear lubricants
Hydraulic fluids
Greases / pastes
Aerosols
Cleaners
- Eurol Additive-S
- Eurol Additive-S RSS 200
- Eurol Assembly Paste HT/AL
- Eurol Assembly Paste HT/FD
- Eurol Assembly Paste HT/FD Spray 400ML
- Eurol Assembly Paste SG
- Eurol BIO Grease CA-2/501
- Eurol BIO Grease SI-000/101-S
- Eurol Chain Lube S-AC 38 FD
- Eurol Chain Lube S-AC 38 FD Spray 400ML
- Eurol Chain Lube S-HT 220 FD
- Eurol Chain Oil S-TP 22 FD
- Eurol CL-F Lube
- Eurol CL-F Lube Spray
- Eurol Fluid RFC
- Eurol Food Gear HV 100
- Eurol Food Gear HV 150
- Eurol Food Gear HV 220
- Eurol Food Gear HV 320
- Eurol Food Gear HV 460

.... (continued)

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Note added at 1 day 29 mins (2019-06-05 12:26:36 GMT)
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As in other questions on this subject, the "S" probably refers to the Syngis range of products.

Eurol Specialty Lubricants with SYNGIS Technology - YouTube
https://www.youtube.com/watch?v=HjoiOO0nDvA
Video for Syngis technology▶ 1:55
May 10, 2016 - Uploaded by Eurol
The SYNGIS® Technology in the Eurol Specialty Lubricants allows lubricating and protective properties to ...

https://www.eurolspecialty.com/en

https://www.eurolspecialty.com/en/products
https://www.eurolspecialty.com/content/webshopproducts/cbde7...
Eurol Additive-S
Highly concentrated Syngis additive
Description:
Eurol Additive-S is a mix of carefully selected Eurol Syngis
additives and has been developed for lubricating
applications which are so heavily loaded that
conventional lubrication is nearly impossible. It does not
contain hazardous components such as chlorine and can
effortlessly replace chlorinated paraffins. Eurol Additive-S
can be added to an existing lubricant such as hydraulic
oil, gearbox lubricant and even metalworking fluid,
increasing EP performance spectacularly. It offers energy
savings through a lower coefficient of friction.