Originally Posted By: shiny
Originally Posted By: Garak
That or an HDEO 10w-30, since I don't have a huge amount of use for an ILSAC 10w-30, when an ILSAC 5w-30 does much the same thing.
Dumb question, but what's the difference between a 10w-30 HDEO vs a 10w-30 ILSAC GF-5?
A "heavy duty" HDEO (or A3/B4) xW-30 will have a HTHS of about 3.5 to 3.6 and because it needs to pass a stay in grade shear stability test, it probably has better quality VIIs used, and probably a higher TBN (10 or more) too.
A ILSAC GF-5 xW-30 will have a HTHS of about 3.0 to 3.1, doesn't have to pass a shear stability test (unless its A5/B5 too) and usually has a TBN of about 8. It should give slightly improved fuel economy, so is "Resource conserving".
So Heavy Duty (HDEO) Vs Resource Conserving (ILSAC).