synthetic motor oil making engine smoke?

[green]

hey, hows it going, for the past 6 years i have been just using quaker state regular motor oil 10w30 with no problems, but this year i decided to use a synthetic motor oil (castrol syntec) i had it in my car for a couple of weeks now but i now find my engine smoking quite a bit, it has never smoked before. is there any reason for this? i hope its something minor , and that the oil did not hurt my engine. thanks.

 

[Roland69]

probly cleaned some sludge out that was sealing stuff up better.....or it's just a coinsidance

 

[speedytang]

I would put regular oil back in the car. I would guess that your rings or valve stem seals are not sealing tight with the synthetic.

 

[ninety15.0]

Conventional oil is comprised of all sorts of varying chain lengths from real short to very long while synthetic oil has much more consistent chain lengths. The short chains in conventional oil find their way into gaskets or pinhole leaks and seal them up. When you change over to synthetic this no longer happens and you wind up with leaking/blowing oil. Change back to conventional

 

[green]

thanks for the info

 

[Sicarius428]

Synthetic also has more detergent in it which is probably eating away at all the gunk that the old oil left... After I did my first synthetic oil change, all sort of gunk came flowing out.
Kevin