Originally Posted By: 21Rouge
Originally Posted By: NHHEMI
Really there is no comparison between the two to be drawn other than they both start with GM. Being on the GM6094M list( or meeting/exceeding the spec )means nothing in regards to that oil's ability to meet/exceed/get certified to the synthetic oil standard.
Originally Posted By: 21Rouge
But is it likely the case that a (energy conserving) 0W30, which right now is necessarily synthetic is further down the road to meeting 4718 than a
garden variety synthetic 5W30?
Originally Posted By: NHHEMI
I would say no because energy conserving has nothing to do with it. Energy Conserving really has nothing to do with the performance aspect of either GM6094M or GM4718M.
Thanks for the replies but I only mentioned energy conserving in passing as I assume that
all GM approved oils are energy conserving? Thats why for example true GC could never be on the list?
Originally Posted By: NHHEMI
Also, I am not sure that technically a 0W-30 can meet the spec because I believe GM included weight specific wording. 5W-30 and 10W-30 only. I don't believe any 0W-30 can be certified although they may meet the spec performance requirements?
Not quite true as M1 0W30 is an approved GM oil in both categories.
Originally Posted By: NHHEMI
I don't believe any 0W-30 can be certified although they may meet the spec performance requirements?
But that is kind of what I was getting at in my initial post but clearly not worded well
. That is, I was thinking that 0W30 oils are techically superior (meet certain spec performance requirements) to synthetic 5W30 simply because to 'make' such a viscosity implies certain benchmark specs beyond those that can be achieved by a synthetic 5W30.
I have an older GM4718M list then because there are no certified 0W-30 oils on it. Just 5W-30 and 10W-30. I would not say a 0W-30 is superior to 5W-30 nor that a 0W-30 has higher bench marks to reach.
And again, GM4718M deals solely with heat resistance. Any real benefit to a 0W over a 5W would be in regards to cold pumpability which relates to GM6094M.