Originally Posted by atikovi
Won't get all the particles that have settled on the inside of the pan to flow out unless you let it drain for hours. Oil thins out when hot and flows easier.
Originally Posted by CR94
... In other words, hot, and as well-mixed as possible, so any gunk inclined to settle out will drain before it settles, I hope.
Originally Posted by atikovi
To get as much of the suspended particles out of the pan, drain it as hot as possible. After a good highway drive is best.
Originally Posted by SirTanon
Even if it's hot, you won't get ALL of the particles that have settled into the pan.. in fact you won't get quite a lot of them. But at least being driven around the block will get some.
So I want to know what everyone is driving that has "gunk" and "particles" in their oil that are heavy enough to settle out of the oil into the pan when you turn the engine off but not be filtered out when the engine is running?
Seriously, who here has engines that dirty?
Originally Posted by atikovi
Hot will get more out than warm and since it's just as easy to drain after getting home from a drive instead of purposely driving it just for the sake of the oil change, it's a no-brainer to change hot.
How so?
I do agree a hot/warm engine will drain a little faster, but not a concern for me since I am in no rush when I do an oil change.
I would say there is not much if any difference in the amount drained out hot vs cold. Cold is a little slower, but oil has drained from the upper parts of the engine so more oil in the pan, hot oil drains faster, but more oil is still higher up in the engine.