AMSOIL EFM or EFO for 2014 ML 350 M276

[bimmerdriver]

I just picked up a 2014 ML 350 with an M276 (FLEX) engine. I have a box of AMSOIL EFM left over from the 2002 ML 320 that I sold.

I was looking on the AMSOIL website for the first time in a while and I noticed they now have FS 0W-40 EFO. EFO has MB 229.1,229.3, 229.5 applications as opposed to an actual MB 229.5 approval, as is the case for EFM. EFO is also rather more expensive than EFM.

FWIW, I will probably never fill the tank with E85, since it's not available where I live.

Is there a beneficial reason why EFO is more expensive than EFM? I would appreciate hearing recommendations on which of the two oils I should be using.

Thanks in advance.

 

[aleneros]

I just picked up a 2014 ML 350 with an M276 (FLEX) engine. I have a box of AMSOIL EFM left over from the 2002 ML 320 that I sold.

I was looking on the AMSOIL website for the first time in a while and I noticed they now have FS 0W-40 EFO. EFO has MB 229.1,229.3, 229.5 applications as opposed to an actual MB 229.5 approval, as is the case for EFM. EFO is also rather more expensive than EFM.

FWIW, I will probably never fill the tank with E85, since it's not available where I live.

Is there a beneficial reason why EFO is more expensive than EFM? I would appreciate hearing recommendations on which of the two oils I should be using.

Thanks in advance.

Maybe this is why...

 

[bimmerdriver]

Maybe this is why...

Thank you for your reply. It rarely gets colder here than -5 to -10C. Aside from the lower pour point, the oils look fairly similar, probably not worth the price difference.

 

[KCJeep]

With the specs he posted you can be certain the EFO has a decent slug of PAO in it, whereas the EFM is likely largely Grp III. Not necessarily a bad thing depending on your needs but PAO does cost more.