I've often wondered why SI and SK were not used for oil ratings. Diesel engine oils had the complete CA to CK lineup.
Why no SI and SK oils?
- Thread starter berniedd
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Originally Posted by berniedd
I've often wondered why SI and SK were not used for oil ratings. Diesel engine oils had the complete CA to CK lineup.
https://www.api.org/certification-p...esel/Publications/150917editionfinal.pdf
PDF Page 14:
Quote
Note: The letters "SI" and "SK" have been omitted from the sequence of letter designators for API Service Categories because of their common association with other organizations or systems
I've often wondered why SI and SK were not used for oil ratings. Diesel engine oils had the complete CA to CK lineup.
https://www.api.org/certification-p...esel/Publications/150917editionfinal.pdf
PDF Page 14:
Quote
Note: The letters "SI" and "SK" have been omitted from the sequence of letter designators for API Service Categories because of their common association with other organizations or systems
SK is a Korean oil company
Originally Posted by hallstevenson
Off-hand I can't say why "SK" was skipped but the letter "I" is normally skipped because it's too easy to confuse with the number "1".
Originally Posted by Hootbro
https://www.api.org/certification-p...esel/Publications/150917editionfinal.pdf
PDF Page 14:
Quote
Note: The letters "SI" and "SK" have been omitted from the sequence of letter designators for API Service Categories because of their common association with other organizations or systems
Off-hand I can't say why "SK" was skipped but the letter "I" is normally skipped because it's too easy to confuse with the number "1".
Originally Posted by Hootbro
https://www.api.org/certification-p...esel/Publications/150917editionfinal.pdf
PDF Page 14:
Quote
Note: The letters "SI" and "SK" have been omitted from the sequence of letter designators for API Service Categories because of their common association with other organizations or systems
Originally Posted by Hootbro
Originally Posted by berniedd
I've often wondered why SI and SK were not used for oil ratings. Diesel engine oils had the complete CA to CK lineup.
https://www.api.org/certification-p...esel/Publications/150917editionfinal.pdf
PDF Page 14:
Quote
Note: The letters "SI" and "SK" have been omitted from the sequence of letter designators for API Service Categories because of their common association with other organizations or systems
A bid "HOOT" to Hootbro. Thank you!
Originally Posted by berniedd
I've often wondered why SI and SK were not used for oil ratings. Diesel engine oils had the complete CA to CK lineup.
https://www.api.org/certification-p...esel/Publications/150917editionfinal.pdf
PDF Page 14:
Quote
Note: The letters "SI" and "SK" have been omitted from the sequence of letter designators for API Service Categories because of their common association with other organizations or systems
A bid "HOOT" to Hootbro. Thank you!
I'm sure there will be no SO oil either to avoid confusion with ESSO
Originally Posted by hallstevenson
Originally Posted by GumbyJarvis
I'm sure there will be no SO oil either to avoid confusion with ESSO
They will most likely skip it to avoid confusion with "is it 'S-oh' or 'S-zero' ?".
Definitely.
I was actually surprised that they have SN+ instead of SP already, I guess it is more of a band-aid while SP standard is already talked about and in draft.
I also won't be surprised things going forward will be only 0w16, 0w20, and 5w30, and let 5w20 and 10w30 just copy the old spec as is.
Originally Posted by GumbyJarvis
I'm sure there will be no SO oil either to avoid confusion with ESSO
They will most likely skip it to avoid confusion with "is it 'S-oh' or 'S-zero' ?".
Definitely.
I was actually surprised that they have SN+ instead of SP already, I guess it is more of a band-aid while SP standard is already talked about and in draft.
I also won't be surprised things going forward will be only 0w16, 0w20, and 5w30, and let 5w20 and 10w30 just copy the old spec as is.
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