Done to death

I used to worry about leaving old oil behind until I got the 1990 Porsche. Since it's "air cooled" it carries 13 quarts of oil around. When you drain it for an oil change, the most you can extract using the proper draining procedure (two plugs) is 10 quarts. So every oil change you are changing 10/13th (77%) of the oil. Officially the correct procedure from Porsche, so must be OK. Now I probably wouldn't run that on a 20k mile change interval, but also tells me not to worry about removing the last tablespoon ...
 
@SC Maintenance @rstsco @Plumb Bob

— Just did an oil and filter change at 2,000 mi. OCI.

— If my oil is not bought within a few days of the job, I won't use it.

— I fell under the influence of some YouTube guys and decided that Honda OEM filters that were Made in Japan were "the good ones," so I bought every one I could find. There will be unused filters in my house long after I am dead.

— My idea of a good time is watching video after video of some guy cutting open oil filters and discussing differences between one and another that are so minuscule that my psychoanalyst wants me to start coming in twice a week instead of once a week.
https://www.psychologytoday.com/us/tests/health/autism-test

Everyone here should take this quiz.
 
Took our company car out of town for a week - overdue on oil change by 1K. Called the owner, Maintenance department, Wife, and Friends, trying to justify AT LEAST to go through the nearest Jiffy. Owner said, " Don't worry about it, it will be fine." Still treated it to top-tier shell (y)

The first step in recovery is acknowledging you have a problem😂
 
That last few drops or little bit of dirt aren't going to cause catastrophic failure. And what do you gain with letting it drain overnight? 5 minutes of additional engine life or maybe we can be generous and claim a few hours. No. You won't be able to measure anything over the course of the engine's usable life nor performance that you could attribute to it. Dump it, fill it, drive on.
 
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