Saskatchewan17
Member
- :
- 2008 TR Mazdaspeed 3
how is it less efficient when it can offer better protection through a higher flash point and better shear strength?
It's thicker. Thicker oil yeilds less efficiency.
That's true. It's too viscous to move efficiently throughout the motor. 5W-40 is only a temporary fix for smoking turbo problems. Other than that, only 5W-30 is neccesary. Anything beyond that will be too high of a weight to be efficient anymore.