Overfilled from the factory?

[Hall]

The thing us that different people wait different time for the oil to drain. Usually, people who overfill are those who don't wait enough.

I check the oil in our cars after they've sat, typically overnight, and haven't been running for 8+ hours. If I have reason to worry that an engine might be low on oil and I can't wait that long, I'll check it and read it and as long as I get a fairly clean 'line' on the dipstick and no smearing all over the rest of it, if there's oil on the dipstick and at or above the 'low' marking, I call it good. Letting it drain longer will simply show it closer to the middle.

 

[Hall]

I do the same—I change my oil when car's front is a bit jacked up on stands. It's not horizontal. That may contribute for some oil unable to be poured out vs people who change their oil when their car is completely horizontal as on a lift.

That could explain why 5 quarts was enough to show properly filled on the dipstick on mine when it spec'd 5.25 quarts. Oh no ! I was always leaving 1/4 quart of old oil in ! In all seriousness though, it also depends where the oil drain plug is. If it's at the back of the pan, when on ramps, it's all coming out. If it's at the front, you'll definitely leave some in as well as if it's on the side of the pan.

Then we have those (some here !) who lower their vehicle or even raise the other end, then let it continue "draining" overnight, to get even more out !

 

[ammolab]

If they're changing their own oil, my money says the vast majority of them are in fact checking the manual.

Plenty of YOU-TUBE addicts change their own oil. Manuals, books etc not a habit for them. Info they receive is all over the place.