oil change

If your oil's clean it's not doing it's job. (well in a diesel at least).
The way to test weather cold or hot is better would be to measure the amount of old oil that comes out, not what colour it turns and how soon.
The more oil that comes out when you drain it, obviously the better the effect of changing it is...

I do mine hot.

Hot or cold not much difference, all the oil would of drained out of the top of the engine overnight. When you take the sump plug out the oil is coming out after it wether it is hot or not.

If it is cold and you don’t move your arm fast enough at least you wont get hot oil over you. When I drop the oil I let it drain for at least 10 minute’s.

In petrol motor (If it is clean internally) The oil should stay a golden colour for 5000k’s or more, in a diesel less

Think about it guys

If you change it cold you will get the most out as it was hot when last run and on shut down it all ran to the sump hot anyway. All you are doing is draining it from the lowest point of the motor which means that you will get more out than if you changed it warm.

If you change it hot it may run out a little quicker however you will need do drain it for the equivalent of time overnight to get the same amount of oil out. You also risk burning yourself in the process.

Just park it overnight in the place that you will be doing the oilchange and you will get the most out after it has been sitting overnight. It has had over 8 hours to drain to the sump.

You will never get all of the oil out in an oilchange as parts of the oil channells go uphill, around corners and have points in the block that are shaped like hot tubs. just look at your oil after a day or 2 from an oilchange and you will see bits of blackness that had been diluted into the clean oil.

If the oil is dirty then it is doing its job by removing impurities. If you change the oil and it is clean then it is not circulating and picking up the impurities properly.

Hmmmm.....
You fellas seem to be missing the point here...
The reason for changing the oil hot, is that (presumably) all of the cr@p that's in there will be "in suspension", and will be removed with the hot oil....
In a cold engine, a lot of the impurities will have settled to the bottom of the sump pan, & will remain there, even though you may "think" that you've drained all the oil... This IMO, would be a contributing factor in sludge build-up in engines....

I always drain my oil "hot" (after a good long run), & leave the plug out overnight.. I'll even jack up the vehicle on the opposite side to where the drain plug is, to maximise the chance of getting all of the oil out... You'd be surprised how much extra oil comes out by doing this...
The new oil is most definitely not black as soon as I run the engine... In fact, it takes quite a while before I can even see where the h#ll it is on the dipstick!!!
(I know the level is correct, just have to get the "angle" right to see it)...
It will of course, be quite black by the time it's due to be changed....

Regards, Ed. C.