Hot or Cold Oil Change

Greetings
I was always taught to change your oil while it's hot.
I see a growing tendency amongst youngsters to do it cold.
Too hot to work on etc.
Fair enough for the filter-hot or cold is not going to affect what's in or not in the filter.

Now, if it's just one engine, easy enough to arrange oil change while hot.
But if you have a few lined up waiting, or been waiting parked overnight, difficult to get that oil hot.

I still prefer to change while hot, and before the (small) chunky bits settle on the sump bottom.
What's the brains trust view?

Cheers

When I was working in a garage we changed them as they came in, hot or cold, cold just drained a bit longer, though these days with some vehicles you have a time limit on how long you can drain oil before you need to manually reprime the system or it can cause a catastrophic failure
Gumpy

I think before the days of oil filters it was important to do them hot as the dirt and sludge have more chance of flowing
with a oli filter there shouldn't be any dirt or sludge in the sump to move, it should be in the filter

Paul

I prefer hot but I'm not making a living out of it. With Bongo I book him in for 1st job so bý the time I drive 30 minutes everything is nice n warm for draining.
 

Hot.

If it's hot, 6 litres. 
Cold, 5.9 litres.

The oils and the filters we have these days I think the difference would be three firths of bugger all, unless it involves a lot of dirt and dust and even then, I would probably think it would be three fifths of bugger all, the air filter is the one that matters most not getting dust into the intake is the big thing to worry about for engine life, 

Hot.

I think that what is being attempted is to get any suspended particles out of the oil - there will still be some stuff even if a filtered system shown by dark colour.

If it is done cold the particles settle in oil galleries and will not be carried out with the oil drain. My guess would be if it has been sitting for a few hours on the hoist you will leave rubbish in the engine but if you drive it in from the car park and onto the hoist and drop immediately the few minutes of running would be enough to stir everything up even without the engine getting up to temperature.

Old straight oils obviously poured better, flushing out the system more when they were hot and thin. Modern synthetics do a very good job holding a standard viscosity so a stir up with a few minutes running to get the settled stuff back into circulation might be a good idea.

Just my thoughts.

I am no expert but I probably do both.
I drain mine hot and leave it overnight with the drain plug out.

My mate who is a ship's engineer (retired) and a car and truck restorer (has been for fifty years) insists on dropping and cleaning out the sump of every vehicle he restores. He insisted that I do it to my three tonner petrol engined Morris Commercial which was in very good condition for a sixty-year-old vehicle and there was about half an inch of sludge in it after I had left it draining overnight.