In Reply to: Frequency based on who pays? posted by Paul on July 07, 2000 at 15:13:10:
Regarding a.) Synthetic oil at 15k miles has better lubrication ability that regular oil when new.
Regarding b.) Synthetic oil doesn't hold particulates much better than regular oil.
So, I change mine every 10k miles because of the inability of the filter to contain the particulates.
With a new engine, I recommend chaging te oil at 3k the first time due to the large amount of highly abrasive content from the machining of cylinders and pistons.
If anyone wants to change synthetic oil earlier, there's no downside to it other than cost, but you are throwing your money away. If it makes you sleep better at night, then go ahead.