Just wanted to give a quick review of Amsoil 0w40 motor oil for the N55 (35i) engine. My car has 75k miles on it. Amsoil 0w40 is BMW LL-01 approved.
Sunday I did an oil change, switching over to this oil from Mobil1 0w40. I can already say that cold starts are drastically improved. It was 5 degrees F this morning and there was no RPM idle dip within the first 10 seconds (always happened with Mobil1). This leads me to believe that the cold viscosity is truly as low as it should be with a 0w oil spec (unlike Mobil1).
Any other Amsoil users out there? I will check back in after a few thousand miles and let you know how it's doing. The next (measurable) test will be examining the oil after about 7k miles of use (my change interval). The Mobil1 came out black, but no gunk in there.
Link to oil:
https://www.amsoil.com/shop/by-produ...?code=EFOQT-EA
cheers!