If he's testing with oil and not air, that's a pretty intensive curiosity level. I'll have to check out the thread when I have the time. I used to read this when it was on MiniMopar.
Pressure drop is the hydraulic equivalent of voltage drop to determine the resistance of a circuit element. It is how we know when to clean the filter in a spa or the air filter in a large HVAC.
Speaking of "used to" ... My favorite free browser was Opera for a number of years. I notice there are still a few hits on my web page from Opera users. Spellcheck is a boon for some and a bane for others. In the "old days" I used to try to spell correctly because the search engines were not particularly good at recognizing common spelling errors. I recall when I won a poorly attended e-bay auction by checking for "guages" looking for the gauge I wanted. Now that trick is long unavailable.
Your spelling of the title of this thread just immediately reminded me of Inglourious Basterds (https://www.quora.com/Why-was-Inglourious-Basterds-misspelled-purposely-by-Quentin-Tarantino) and I couldn't shake it.
Where I've found poor attention to spelling particularly useful is in debugging software from searches based on typos in log messages. A boon for me.
Okay, my choice of flitters shouldn't be of consequence to anyone -- as I have no tests or evidence it is a good choice. But you asked;)

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Art Benstein near Baltimore
The older we get, the fewer things seem worth waiting in line for.
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