Originally Posted By: Clevy
Originally Posted By: B320i
Originally Posted By: Bror Jace
They tested three weights of their HDEO oils against each other and found no appreciable difference in wear. Many people (not necessarily BITOGians) associate thinner oils with higher potential for greater wear and/or engine damage. This test suggests otherwise:
http://farmindustrynews.com/farm-equipment/what-s-your-engine-oil-iq#slide-0-field_images-71081
On the side of being a smart-[censored]... Someone should send this to the folks over at Penrite. Or to every Australian who buys into "thicker is better" myth.
That might topple their marketing scheme. LOL
In all seriousness, though, as long as the oil you are using can be moved in volume quickly enough to all the parts of the engine, even very thin oils should be more than good even. Thinner oils just have to be more resistant to shearing, since there is less buffer between the two moving surfaces. The flow would make up for this, somewhat.
Engines are also built to much tighter tolerances now, which means thicker oils may not be as good, even if the pressure meets manufacturer spec.
Tolerances have little to do with oil grade used in an engine. THE CLEARANCES are what's important and may dictate an appropriate grade.
Good point.