Originally Posted By: userfriendly
All easily explained. Sit up and pay attention so I don't have to write this out six times: For an engine oil to pass an API, manufactures' or other governing body's specification, the finished product is compromised by all the hoops it has to jump through.
Yes, proof of performance such as maximum levels of wear, deposit control, oxidization resistance.....etc.
Originally Posted By: userfriendly
Such as reduced additive levels
For the API ILSAC approvals, not for any high performance applications and this only applies to "Energy Conserving" oils, something a 0w-40 is not.
Originally Posted By: userfriendly
and viscosity to meet fuel economy targets.
The grade is defined by a range of viscosity. If an oil is a 0w-40, its viscosity falls within the range for a xW-40. Then there is also HTHS viscosity of which many of the manufacturer approvals (and European approvals) have a minimum necessary.
Originally Posted By: userfriendly
The reduced viscosity may cause the engine to consume oil which can have downstream effects on TWCs and particulate filters, which is the prime reason the anti wear levels are lowered. That is called connecting the dots.
Are you talking about using a 20 weight where a xW-40 is specified here or what are you trying to say?
Originally Posted By: userfriendly
Unlicensed lubricants may in contrast have a higher viscosity
Compared to what, an oil of a different grade? Redline 5w-30 (unlicensed) and Castrol GC 0w-30 (licensed) are both heavy 30-weight oils with very similar viscosities in terms of their positioning in the 30-weight range.
Originally Posted By: userfriendly
as well as a more robust additive package.
Like GC, M1 0w-40....etc Basically any oil that isn't Resource Conserving.
Originally Posted By: userfriendly
The evaporative losses and oil consumption will likely be reduced in addition to the wear numbers.
Measured through NOACK. Amazingly M1 0w-40 (approved) has a lower NOACK/Volatility (8.8%) than Redline's 0w-40 (non-approved) (9%).
Originally Posted By: userfriendly
To top it off, the cherry on the cake is a lower cost due to the savings the blender otherwise would have to pay for testing and licensing that is passed on to the consumer.
Redline 0w-40 is massively more expensive (unapproved) than M1 0w-40, GC 0w-40....etc. In fact Redline's oils are some of the most expensive on the market.
Originally Posted By: userfriendly
Now there is a list of at least ten items, five for one, and five against the other that equals up to ten times better.
That's some pretty funky math