When to drain oil??

[10G]

I've thought it's best to drain your oil in the morning after your vehicle has been sitting all night and every last bit of oil that is going to end up in the sump should be there.

But there's also the train of thought that you should drain your oil when it's warmed up / hot so it all drains out as it's thinner at that time.

What do you guys think?

[mudnut]

Depends on how much time you have. In the morning, all the oil that will drain away has done so just after the engine shut down. The length of time that the oil drains out cold is extended. If it is at operating temp, the oil will flow quicker, but there is still oil to be drained from the rest of the engine.

[mudski]

Best when the oil is still warm as its at its thinnest so more will drain out. I usually would drain mine around half hour after the engine has been running and at running temp.

[10G]

Thanks guys.

[Brissieboy]

Old school theory was that it is best to drain while hot and immediately after a good run. That way all the crud is mixed up in the oil so drains away instead of settling on the floor of the sump just waiting for the new oil.
Not sure about about more draining out when hot because of the action of multigrade oils that thicken with temperature. Would have been true in the old days before multigrade.

[10G]

That's something I hadn't considered, the draining of the crud, I'm sure you'd get more crud out when hot. Thanks Brissieboy.

[pollenface]

Always change it hot.

[jman69]

I always drain mine after it's been driven for a while, so it's nice and hot. Then i let it drain over night to get as much of it out as i can, refilling in the morning.

[Caboosewa]

You might not want let it drain to long, could empty The oil pump and create extra wear on start up, the filter is what gets rid of any thing that’s not oil and the oil will always be black that’s just old school Diesel engines


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[Cuppa]

Drain when hot 'cos I just love the extra challenge of getting into the difficult to reach filters when they are hot, & nothing better than getting hot oil splashed on me when cracking open the sump plug!

Nope

But I do drain it hot for all the reasons others have given.