Well Im due for a new oil change and I just want to know if Castrol Syntec oil is the way to go.
I know synthetic oil is much more thin then just regular oil and that it last for more then 3K miles, but does it have that much of a diff. over the regular stuff?
and
I also was told that once you go synthetic with your oil, your motor is required to have synthetic for the rest of its life? Is that true?


For about $5 a quart, this oil better live up to its price!