[bavarianride]

My N26 had a recent oil change at dealer, and after that the engine sounds quieter than before. The last job was also from dealer with LL01FE 0w30, which is the same listed on latest invoice.

Maybe the tech put in LL14FE 0w20 instead? Just a guess .... mpg also gets improves by 1-2(not enough refuel yet to be certain).

So the question to the forum is, how good is this LL14FE 0w20 for DD, e.g. highway, hilly, city, etc, etc?

[JimKden]

Are you referring to LL14FE+ 0W-20?
If so, here is my take. The LL14FE 0W-20 came along with the B series engines. New with the B series engines is connecting rod bearings with the upper half different material from the lower half. This seems to be in concert with the lighter viscosity oil 0W-20.
So it seems the N series engine should stick with the oil weight originally specified for best engine (rod bearing) life.
My hunch comes from being in the oil business for 40 years.

[bavarianride]

Originally Posted by JimKden

Are you referring to LL14FE+ 0W-20?
If so, here is my take. The LL14FE 0W-20 came along with the B series engines. New with the B series engines is connecting rod bearings with the upper half different material from the lower half. This seems to be in concert with the lighter viscosity oil 0W-20.
So it seems the N series engine should stick with the oil weight originally specified for best engine (rod bearing) life.
My hunch comes from being in the oil business for 40 years.

That is good feedback. According to foremen and SAs, post-LCI N20(e.g. 320i) gets 0w20 from factory(pre-LCI was 0w30), while the N26 still gets 0w30.