Warm up before oil change?

Cold engine. Pull the tank.

All:

Running the engine for an oil change is the recommended method.  Normally you are not just doing an oil change, you are completing an annual or some other work.  Most pros I know will do the visual checks first.  This is done with a print out of any relevant SB or ASB and see if any need compliance in the log book.  The warm engine is essential for a cylinder leak-down test.  You need to verify ignition drop and fue pumps and a host of items.  The list goes on and combining tasks just makes the whole job go smoother in my view.  There is no question that warm oil will drain faster from the oil tank also, another plus.  The check list is for you to ensure that all the items get covered, it does not have to be in order, do what makes sense for time and best use of tooling. 

I would recommend that some visual checks be done after the engine warm up also.  Things like checking the vent lines for fluid build up and looking for drips from your water pump.  You are going to run it up regardless so why would you want to do a cold oil change?  I really do not see any added value to that idea. 

My opinion as always. 

Cheers