It is okay to change the oil every 10,000 miles.

A Prius is different and more problematic with its Atkinson cycle engine and frequent stop start thermal cycling. But it is your head gasket and oil consumption.

 

I removed and cleaned the intake manifold on our 2014 Corolla when I installed an oil catch can, and there was no egr cooler, and no egr passages in the intake manifold like in the the Gen 3 Prius.

Therefore, the Corolla doesn't inhale dirty/sooty air into the cylinders, which I'm sure has some blow by gases making it into the crankcase and oil.

Posted via the PriusChat mobile app.

 

I change mine every 5K.

 

I happen to change mine at 5k. Just did it an hour ago.

I did one at 10k early on. There wasn't any meaningful consumption found then, and the color wasn't even bad. But I like 5k better, so I do that.

If the cost of oil quadruples I'll stretch it back to 10k, but I'm set until then.

 

I have been changing the oil every 10k for both my Prius and Prius-C since new. I did not notice any meaningful oil consumption on my Prius until last year. At 110k miles I saw obvious oil consumption on my Prius, so I started changing the OCI to 5k.

As for the Prius-C, it has been parked in my garage since May 2020. I just wonder if I should clean the EGR and intake manifold, and reduce the OCI to 5k. I didn't notice any oil consumption at my last oil change at 11k miles 18 months ago.

 

I think oil and a filter are cheap insurance. In all of my previous cars, I changed things at 3000 miles. In my 2018 Prime, I change oil and filter every 6 months. Since I do it myself, and it is super easy - I just use the opportunity to look things over and make the neighbors think I'm Mr. Super Mechanic - which I am not - haha.