Quote:
Originally Posted by oceanview
In general two factors are important:
Viscosity and Quality (BMW allowance)
The possible viscosity variances for the N55 are quite small.
0W to a 5W cold viscosity and 30 to 40 hot viscosity is not a big of a difference. (compared to a 0W-30 to a 0W-60)
BMW Longlife-01 and BMW Longlife-01 FE certification is important as other oils not having this lable could ruin the engine. (different or missing chemical additives)
Above quoted text from the owner's manual
http://dn1.bmwsections.com/dl.php?li.../2013_3s_s.zip
Hope I got it right.. |
30-40 hot viscosity is a huge difference.
Smoother idle, smoother engine. I've noticed a significant better running engine going from 5w-30 to 5w-40.