Oil Change Interval

You can go a lot longer on synthetic I think.

I go about 5000 miles on conventional oil as opposed to the 3000 mile recommendation.

i go 7000 on synthetic

Have you considered checking your owners manual to see what it says?

I go 5k in my Jeep, and we go 10k on the synthetic in my wife's Toyota.

Read the manual. Do what it says to do. No more, no less. The only way you should sway from that is if you pull samples and have them checked, and that makes no sense on a regular vehicle.

The people who made the engine paid a lot of smart people a whole lot of money to figure that stuff out. They can't be too conservative because having more service events than the competition will cost sales, they can't be too aggressive because the engine won't last and that will cost sales.

I know you like to pull up the "don't get your advice from the Internet experts" card when it comes to guns, well I'm going to pull it here with oil changes. The people who built the engine and wrote the book are paid very well to know more about this stuff than the Internet does.

It may not be the same for more modern vehicles but I let the level tell me when to change. My engine eats about a quart every 3000 or so depending on usage, so when I've already added a quart but it's low again I just change it.

I run Royal Purple, I have read of people going 12k intervals on it, but I stick to 8k (my truck calls for 7500)

Really do what your manual says to do.

My thing usually says to change my synthetic around 5500mi, and I drive hard