Originally Posted By: mozart
Originally Posted By: Mark888
Probably about half a quart. Most vehicles will give a spec for the amount of oil that is put in at the factory and how much is needed for an oil change, and the difference is obviously how much stays in after an oil drain (because of some at the bottom of the sump or just clinging to engine parts). But some of it stays in the filter that gets changed, so actual amount may be less.
I know I'm gonna get flamed for this, but I would think flushing with some fresh oil would help wash the remaining dirty oil out and exchanging it with clean. I'm talking about just pouring fresh oil in while the drain plug is removed. Maybe a 1/2 quart.
Last time I asked about this I was called all kinds of crazy.
I do that. Both of my cars take 4.5 quart fills, so I pour the other half quart through the motor with the drain plug out to help flush out any old oil.
It's not that crazy.