Quote:
Originally Posted by spadge
"Longlife" is the BMW name for the oil approval, it has nothing to do with a longer oil interval  |
Sorry, yes I understand that. Some research on the missing LL-01 spec on 0W-40 "FS"...
The consensus on the BITOG site says that BMW changed the LL-01 test spec recently to include the N20 engine and the new formulation didn't pass; no details why. Hence ExxonMobil can no longer claim it meets the (changed) LL-01 spec; even though the new formulation does prior to the spec being changed. They also had to change the name slightly, hence the FS designation.
I don't have an N20, I've been using it forever in my M54s and I will continue to use it.