I do oil changes at work for my job. We dont even sell pure dino oil anymore and I've never had one come back for a leak unless the oil plug hole was messed up and leaking. That's not a issue with the oil though. We do oil changes on cars all the way back into the 90's and even some from the 80's.
The thing I like about full synthetic oil is the fact I can go 5000 miles between oil changes instead of 3000 like with pure dino oil
__________________
|