what are oil change intervals with synthetic oil

Hello, Always follow the service intervals outlined in your owners manual. Manufacturer specifications trumps oil manufacturer specifications.

Many engines have met their demise resulting from that line of thinking! Sometimes engine oil levels can drop to extremely low levels - one whom is thinking it's ok until next engine service find themselves with major expense due to internal engine damage. I have personally witnessed that a time or two - after the wrecker drops them off at the shop.