I dont think its a good idea to put synthetic oil in an old motor thats full of sludge.It will start leaking everywhere.I dont know about the molecules but it looks thinner to me when its hot.If you rebuild a motor and have it boiled out,put new seals in it(better check if the seals will work with synthetic)and put synthetic oil in from the start it would be fine. You may want to know this,years ago they made synthetic oil to replace gear oil,80 weight as I remember.A driver was driving,had a seal go out and got it fixed on the road.Somebody added synthetic oil to the mineral oil in the transmission and it ruined the transmission.The synthetic gear oil was not compatible at all with mineral oil and it sort of congealed or tuned real hard inside all the galleries of the transmission.I tore the transmission apart and tried to save as much as I could,but about all that was left was the case and it had to be steam cleaned.I dont think its still like that,and I have not heard of a motor doing that,but its not a good idea to mix them I dont think.You could never get all the old oil out of a moter very easy without tearing it down and cleaning it in a hot tank.
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