Simple question....some specs meet current needs for a long time (API SE, 1971-1981), while some are very short and 'transitionary' in nature (API SL was what, 3 years?)
I think API SN will be with us for a while - engine technology, I think, has hit a 'plateau' - hybrids and small-displacement, DI and turbo engines are going to be the 'answer' for a while.
Also, I think SN has taken us to the ceiling of the use of 100% 'conventional' oil - ie, group II. You can meet SN with a mostly or all group-II-/II+ oil. Next spec probably won't allow the use of anything less than a group-III.
What say you?
I think API SN will be with us for a while - engine technology, I think, has hit a 'plateau' - hybrids and small-displacement, DI and turbo engines are going to be the 'answer' for a while.
Also, I think SN has taken us to the ceiling of the use of 100% 'conventional' oil - ie, group II. You can meet SN with a mostly or all group-II-/II+ oil. Next spec probably won't allow the use of anything less than a group-III.
What say you?