Originally Posted by TiredTrucker
Originally Posted by addyguy
I like the idea of a completely different marking to set 0W-16 oils apart from other grades. Good job API.
The new API SP oils still won't be marketed for another full year, LOL. SN has been around for, what, 10+ years now?
Is API SN the longest-running classification?
True, but API SN+ is the newer that SN line. SP? Make me wonder what happened to SO.
I and O look too much like 1 and 0, so I and O aren't used - pretty much industry standard nomenclature practice. Not sure why they didn't use K.