Originally Posted By: crazyoildude
A lot of these "papers" and research that is being done are flawed because the people that write them have agendas and jobs to keep.
You're right, automotive engineers do not have jobs to keep. They work for free.
Who has an agenda to discourage frequent replacement of air filters? And if Honda was so concerned about oil flow restrictions related to oil filters, why would they recommend replacing oil filters every other oil change? The more a filter loads, the lower the flow. If flow really was the king of the hill when it comes to oil filtration, they would call for filter changes more often than oil changes!
Originally Posted By: crazyoildude
Except full throttle... Its those exceptions... Im sorry you are correct i should have mentioned that Bypass is dumping dirty oil into an engine. You want to try to avoid bypass otherwise why use a filter? There is a reason why Motorcraft, Mopar, Toyota, Honda and the list goes on does not have these 99.9% Claims on oil filters or does everyone just think they don't know how to build a restrictive filter?
The full throttle comment was in regards to air filter restriction and acceleration, not full throttle mpg or oil flow.
The reason Motorcraft, Mopar, Toyota, Honda and others do not have 99.9% efficiency claims is that they are not in the business of selling top tier air or oil filters. They are in the business of selling cars for a profit. Spec'ing a filter that costs even $1 more per unit would mean a $9.9 million hit to GM's bottom line in 2014 on new car sales (based on worldwide vehicle sales of 9.9 million). Flow and efficiency are not mutually exclusive. See
this thread that shows great flow from PureOnes, which have excellent filtration.
I would wager that Fram Ultras have greater efficiency
and flow than OEM filters. BUT, they cost a lot more (in the grand scheme of things).