Originally Posted by Sayjac
I wouldn't do that because 'for me' the idea of wasting new oil would trump any benefit pouring new oil to drain out might provide. So unlike prefilling which I do, 'I' wouldn't feel better about doing that. Figure regular maintenance (now mostly 1 year ocis) with hot-ish oil, sump drain enough. I will say I now keep draining till after oil filter comes off, extra oil seems to come out with that. Some folks do filter first, which perhaps the preferable way, just always started with drain plug. Everyone has their own quirky methods and it's a benefit of diy.
As for 20 minute sump drain, after drain plug pulled I'm in no hurry. Pulling filter, preparing new one including lubing sealing gasket, cleaning drain plug and oil filter engine block gasket area all take time. No hurry to complete. I don't know if they still do but locally AAA used to advertise ~20 minute drain with OC. Correct though, most "quick lubes" not going to wait long. Even dealers not going to spend much time on oil drain.
And in the long run it's not likely to make a difference that a tenth of a quart more is out. It's a rounding error.
In my case I was changing oil brands and had a quarter of a quart of the previous one left. It was the first oil change after it sat in the garage for months because the transmission was toast and after I got it replaced with a rebuilt one. I might have started it maybe twice. And changed a year before the car got garaged. I didn't change the oil then because it didn't make sense for this temporary garage queen.
There was no rational basis for doing it, but I did anyways. There's no rational basis to prefill an oil filter the size of a Purolator L14610 anyways. It'll fill up in a split second and the antiwear film and residual oil is going to provide adequate protection.
I guess the big thing is that changing the oil in a modern car because it's "dirty" is kind of silly. I've changed oil in cars where the color on the dipstick after a change is like new oil from a bottle. Others where there's 30% of the oil left after a change and it only lightens up. I still see advertising saying that one reason to change the oil is to remove contaminants. I rarely see anything that's says to renew depleted antiwear/antisoot/antisludge additives. Nothing about TBN. More frequent changes might help with sludge monsters, but so will a more sludge resistant motor oil at longer intervals.
