Over on the tech bored, the topic of oil change and if it is better to change hot vs cold has been discussed. I always wondered if the oil that was cold was any differnt than the hot oil (save the temp & viscosity). I tested both hot and cold to see if prehaps the hot oil stirred things up more and kept it in suspenion better. Not a true study based on statistical methods but never the less it was interesting. Both oils look pretty darn close. So close that I would say that oil smapling can be done hot or cold.
Draining is another story. Drianing cold will take much much longer. If you have nothing better to do and you don't like hot oil dripping down you arm, cold changes may be fine.
Personally, I like hot oil dripping on me so I get it rip snorting hot and stick as much of my arms under the blazing stream as I can! J/K
Here are the oil analysis results on my 96 Volvo. I did change the oil because the oxidation/sulfation/nitration was getting high. but interestingly enough, the TBN was still pretty good. Mind you, there is 48,000 on this oil.
