I see no value and very possible a downside in using a filter that doesn't met Manufacture specs. We don't have the data to counter the recommendation of the manufacture. Ed
That would also seem to be saying you don't trust the large aftermarket filter makers to properly specify oil filters for these special cases like Subarus with an OEM filter bypass spec of 27 PSI. I doubt they are randomly specifying filters without some engineering research behind it. And as mentioned before, the actual design of the oil filter and its dP vs Flow performance has an impact on what the bypass valve setting is. Could be that the OEM Subaru filters have a high dP vs Flow curve, and/or Subaru thinks their drivers will be revving the engine high shortly after cold start-ups which is why their bypass setting is so high.I see no value and very possible a downside in using a filter that doesn't met Manufacture specs. We don't have the data to counter the recommendation of the manufacture. Ed
So Subaru says they will tolerate a 27 PSI drop across the filter before opening to additional flow? So how is 12 PSI (or similar) worse? Or harmful? Is it allowing captured crud back in to the engine?
That could depend on the filter orientation and the location of the bypass valve, and where captured crud can deposit and settle in the can. That's why Ford came out with a base plate located bypass on filters that mounted base upward.Captured particles don’t get injected into the engine when the bypass opens. With the valve open, some oil simply bypasses the oil filter media and goes back into the engine unfiltered.
That would also seem to be saying you don't trust the large aftermarket filter makers to properly specify oil filters for these special cases like Subarus with an OEM filter bypass spec of 27 PSI. I doubt they are randomly specifying filters without some engineering research behind it.
Can we have a skyactiv bulletin copy posted here?
I use random filters. Never did have any problems with any vehicles including Mazdas with skyactivs.
Specific cases sounds like fear scare bull
I was taking about the large aftermarket filter makers to properly specify oil filters for these special cases like Subarus using a bypass setting similar to the OEM filters - the filter makers that do specify filters for them that do have a higher bypass setting. I highly doubt any big name filter maker is just going to specify any oil filter solely based on the "general size and thread type". It's not hard to get a dP vs flow curve either by test and/or modeling for every oil filter model they make, and then ensure it will work on engines with oil pumps that put out the highest expected flow volume (worse care scenario).But that’s exactly the point… I don’t trust these aftermarket companies. They spec a filter for your car based on a general size and thread type.
And it states nothing about bypass pressures, oil pressure sensitivity, causing damage to engines... and all that internet BS scare fear that too many push
And it states nothing about bypass pressures, oil pressure sensitivity, causing damage to engines... and all that internet BS scare fear that too many push
And it states nothing about bypass pressures, oil pressure sensitivity, causing damage to engines... and all that internet BS scare fear that too many push
"To avoid engine damage", is a chickenshits brainwashing ******** statement, for the paranoid. Eventually, you'll need to make sure you buy dealer sourced air for your ICE engines.
Specifically what damage do Mazda's filters cause? And, you want to use it!
Rather than it being filtration or bypass related, is it possible that the mounting flange and/or threads have a different depth, preventing full engagement of the o-ring, or maybe not long enough leaving the threaded part too short to fully engage the threads?
Rather than it being filtration or bypass related, is it possible that the mounting flange and/or threads have a different depth, preventing full engagement of the o-ring, or maybe not long enough leaving the threaded part too short to fully engage the threads?
Without any information from Mazda, this entire thread is pure speculation, since it doesn’t appear that any of the aftermarket filter manufacturers have removed the appropriate cross-references to avoid lawsuits? Seems like if there were engine failures caused by aftermarket filters, Mazda would kick this into their laps, and there would be class-actions all over the place?