Oil and change frequency?

[Alati]

I got my 2009 Mazda6 with 160k miles on it about a week ago. Absolutely love it. Of course it has its quirks and faults and whatnot, (if someone can tell me why it likes to try to jump out of my driveway when I reverse the first time after I start it each day that’d be cool) but I really just want it to take the best possible care of it and, well, I’m not super car savvy, but I’m trying.

Since is has so many miles on it I should change the oil more often than the usual 3k miles right? Is there a specific oil I can use to reduce wear on the motor? And gas, will using a higher grade increase longevity or make any sort of difference?

Sorry if these are super noob questions, I just wanna do right by my new partner in crime.

 

[Grubbworm]

I change the oil in my 2021 Mazda 3 about every 5000 miles (give or take) with 0w-20 Castrol Edge Full Synthetic and a K&N oil filter (with the nut on the bottom). I also use a quart of Motor Flush before every oil change. Mine calls for 0w-20 oil, but I would use the weight oil yours calls for.