Breaking in a new Yaris

[hystria]

Originally Posted by BMGYaris

Hey guys, this is just a theoretical situation. Its not like I did it or anything.

But what if someone got their car with say, less than 15 miles on it. drove it slowly home for 15 miles.

Then drove a 100 mile road trip in going some 110-120 the whole way, just because it was the first time he/she could. What kind of problems might he/she need to go get checked for at the shop?

an engine is an engine. sure, they say baby it the first hundred miles, try doing city driving instead of highway... at one point it helps, but how much ? statistically saying, maybe that engine would run 2% better that others...

if that is not a matter, drive it as you like from the very first mile. it's my advice as a mechanical engineer, two things seems to be important: use mineral oil for the first thousands miles and never rev high a cold engine.

rage2: what you are saying is all about the oxygen sensor, the hotter it gets the faster it starts work at his normal range

[YarisPR]

I really never gave the car a break-in since they come already tested from the factory. I just droved it hard a couple of times. I just think my engine came with the expected 106hp since we know hp factory numbers are estimated.

[rage2]

Originally Posted by hystria

rage2: what you are saying is all about the oxygen sensor, the hotter it gets the faster it starts work at his normal range

No, I'm not talking about a cold engine vs a warm engine, I'm talking about 2 identical engines, one broken in "easy", and one broken in "hard", or drive it like you stole it. The engine broken in hard will be more powerful.