German Castrol Still Available - USA ?

[Japanese]

100% The Green sweet smelling oils are ester synthetics. Doesn’t mean exclusively ester but ester dominate probably.

The green is a dye added to show that the oil is synthetic and to easily spot leaks.

Esters are formed by a chemical reaction between an alcohol and a fatty acid — this is called esterification:
Fatty Acid + Alcohol → Ester + Water

This is the EXACT same chemical process used to make:

• Fruit candy flavors and gummy bears
• Perfumes and cosmetics
• Artificial fruit flavorings

Why does this create a fruity/sweet smell?
Esters have a "fatty" smell to them because they are made of fatty acids and alcohols — the only esters that have truly "fruity" smells are those used in cosmetics and pharmaceuticals, while esters used in motor oils have little smell on their own.

However — when heated, the esters definitely smell sweet — while PAO smells more like mineral oil.

 

[edyvw]

The green is a dye added to show that the oil is synthetic and to easily spot leaks.

Esters are formed by a chemical reaction between an alcohol and a fatty acid — this is called esterification:
Fatty Acid + Alcohol → Ester + Water

This is the EXACT same chemical process used to make:

• Fruit candy flavors and gummy bears
• Perfumes and cosmetics
• Artificial fruit flavorings

Why does this create a fruity/sweet smell?
Esters have a "fatty" smell to them because they are made of fatty acids and alcohols — the only esters that have truly "fruity" smells are those used in cosmetics and pharmaceuticals, while esters used in motor oils have little smell on their own.

However — when heated, the esters definitely smell sweet — while PAO smells more like mineral oil.

Old German Castrol wasn’t green because of dye. At that time you had two versions of 0W30:
Made in Germany and Made in USA.
USA one was regular amber color. Some PAO, mostly Group III.
Made in Germany was loaded with PAO and Esters.
However, color was due to specific additive “Ketjenlube” made by Kyocera corporation.
Castrol (before being acquired by BP) was using that additive to develop SLX oil which was known here as Syntec 0W30 Made in Germany.
Ketjenlube was purchased by LukOil I think and BP dropped contract around 2008.

 

[tired]

However, color was due to specific additive “Ketjenlube” made by Kyocera corporation.

Cell phones and motor oil additives. What an interesting product mix.

Reminds me of the old Onion article.

https://theonion.com/yamaha-ceo-pleased-with-current-production-of-jet-skis-1819570984/

 

[XJRiver]

Also Yashica film cameras.