I don't know the details off-hand, but from what I've seen, the change from API SM to SN will not be a 'large' one as far as oil formulations/specs are concerned.
Additive levels haven't changed at all, ZN is still =/>800; PH is still =/>600; NOAK is still >15%. Changes are minor, and involve additive volatility, and friction reduction for FE.
So, API SN oils are going to 'look' the exact same as SM. If you look at the PDS of the new Pennzoil 'Ultra' Syn, the specs are almost the EXACT same as PP....you can't really tell a difference.
You could often easily tell an API SL oil from a SM - additive levels were lower, SM oils were often slightly thinner than SL versions, and additive packs changed. With SN, I don't think you're going to see this, the oils will look the exact same.
I know the changes that have been made to the requirements are subtle and necessary, but I'm not sure we really need a new API category.....your thought?
Additive levels haven't changed at all, ZN is still =/>800; PH is still =/>600; NOAK is still >15%. Changes are minor, and involve additive volatility, and friction reduction for FE.
So, API SN oils are going to 'look' the exact same as SM. If you look at the PDS of the new Pennzoil 'Ultra' Syn, the specs are almost the EXACT same as PP....you can't really tell a difference.
You could often easily tell an API SL oil from a SM - additive levels were lower, SM oils were often slightly thinner than SL versions, and additive packs changed. With SN, I don't think you're going to see this, the oils will look the exact same.
I know the changes that have been made to the requirements are subtle and necessary, but I'm not sure we really need a new API category.....your thought?