I'm not making any conjecture relative to what is going on with the CTS cap, spring assembly, and oil flow. As I said, I have no idea - it was your statement in the video that you imagined issues with oil flow. We have a serious communication barrier. I asked you how does the spring assembly effect oil flow per your video comment that you "imagine" it impedes oil flow. I assumed, given all the work you've done, you would have played with that sub-assembly and figured out how what its function is, how it works, and whether it could impede oil flow. I wouldn't have asked, except I actually thought your observations were interesting (relative to the CTS design vs stock). But no worries. I realize in your manner of thinking you believe you've given rational explanations for every decision you've made. I just don't understand them and, honestly, I don't need to. It's your car and your experiment.
I also pointed out that my CTS cap took the plastic assembly snap into place. The cap is 6061 and doesn't flew much, so it takes a pretty good push to get it to snap, but I'm sure you knew that already so I didn't go into why. The stock unit is plastic on plastic, and flexes more easily to snap.
Filippo
Look Filippo, you are either not understanding words, or you are projecting your bias, or you are being straight up dishonest. Nowhere in the video do I state that the difference in form factor causes impeded oil flow of any degree.
"Deviation of oil flow from factory design" is NOT the same thing as "impeding". I would appreciate you clarifying yourself.
How the oil flow deviated from factory design is completely a mystery to me...whether it makes it flow faster or slower...I have no idea. But common sense dictates and physical oil metal particles have shown beyond doubt or conjecture that the combination of of the steel filter and the CTS cap absolutely results in abnormal oil metal content from my past oil changes. Nothing has been changed on the car EXCEPT for the CTS cap and KP metal oil filter and motul.
I doubt it is the motul oil that is the issue.
So you pulled it apart and you made all these conclusions based on the fact that the cap is metal and the stock is plastic... and you justify the form factor differences as a function of base material? You discounted BMW design and defended an aftermarket company that makes parts for multiple makes and models....
I disagree with your justifications and defense of them, as history and experience has shown that aftermarket shops that deal with multiple makes and models tend to commit design errors more often than not...no matter their reputation. They think they made a "better" design only to find that they didn't fully understand the original design fully. Take the infamous ECS Tuning n54 light weight pully...they thought lighter was better until people started to destroy their engines after installing the pully which was so light it provided no counter balance to engine rotation.
I ask you though, your justifications are clever... if CTS has 3 missing nubs and an inverted center nub...all completely opposite of oem design, why in the world would they required you to transfer the oem inner core from oem cap that makes use if these 4 completely opposite direction nubs? You are justifying this as a materials based reason. ..and it does not compute.
I believe no material change in production can account for the extremely high gross size difference of the height of the protrusions. I can believe your theory about the metal tabs requiring more force to snap into place (these are micrometers difference so it is possible).
I cannot however, believe the justifications for the missing protrusions. They are simply too big in size and too specific in location to be dismissed. I measured the filter in place after I noticed it did not snap and lock. The measurements were same as stock filter in locked position, so there was no reason for me to attempt to jam it into place.
And one last time, I say to you and anyone here who wants to argue - those missing protrusions that are now not pressing on the rear cap of the inner core absolutely causes oil flow deviation from BMW stock design with the 4 protrusions in place. How the flow is affected is AGAIN unknown to me. But to say that the missing pieces have zero affect on oil flow is to go against common sense AND against my documented evidence of increased metal particulates in each oil change.
