GBMUD Posted September 6, 2006 Share Posted September 6, 2006 On the subject of hot or cold oil, I have understood the following. If the oil is hot and the car recently run then all the sludge and nasties are suspended in the oil and therefor come out with the oil rather than remaining in the engine to contaminate the new oil. Any oil around the top end of the engine will be nice and thin and will soon run down into the sump. The alternative being that all the sludge will have all settled out in the sump. It does not take long for oil, even cold, to do this as otherwise all the oil would be at the top end after a few minutes of driving... I guess that there may be a case for keeping the oil cold and thick in the hope that it will pick up the sludge on the way out. I am no expert in fluid dynamics but changing it hot seems to make sense to me. Chris Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.