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Message: <blockquote data-quote="swampratt" data-source="post: 4347770" data-attributes="member: 15054">I called Mobil corporation 20 years ago and asked them a question.How long will the synthetic oil of theirs last.Answer: If the bottle has not been opened then 10 years but shake the bottle up as the detergents can settle to the bottom and you can see this in the bottom of a container that has been sitting on the shelf for a long time.. you will see dark stuff on the bottom of the bottle.After you open the bottle the shelf life is 1 year.In an engine 6 months is it.NOW onto the question.Drain it cold.No need in trying to circulate that oil.They say the reason to change the oil when it is hot/warm is because the contaminants are suspended in the oil and it removes them better.I have changed oil cold and hot and it made no difference in how long my engine lasted.If you think about this for a minute.How long does it take to get all of the oil to drain to the bottom.I would not want that old nasty stuff clinging to anything in my engine.I use good oil also and for my flat tappet stuff I use VR1 racing silver bottle  or Driven oils.Fill the filter with oil  if you can.  it gets to the bearings that much faster.The detergents  and additives in the oil are what break down.BREAK DOWN: Do not do their job as well as they should.You can have clean looking oil but it may not protect well.</blockquote>