When I get my TSX I'm wondering should I break it in full auto mode or sport shift mode?or both?

 

IMHO it doesn't make any difference to the engine which mode you are in. However, controlling the revs is a lot easier in SS mode.

 

i agree with the jlukja here. it really makes no difference, and my opinion on the break-in in general is that it's not as critical as some of us think. but i still do it for 500-750 miles anyways, just in case.

 

the important thing about breaking in a new vehicle is to vary the rev range a bit.. ie dont leave it in cruise control
with that said, the SS mode should help you achieve that goal easier

 

I agree with what he^^^ said. You absolutely need to vary your rev range...you want your piston rings to seal as completely as possible and if that means bringing that bitch up to 7000rpms once in a while you do it. The last thing you want is to keep that car at a steady rpm range for long periods of time in the beginning...those are the motors that are gonna have signs of blow by after time. Most people dont realize it but the most important time in the break in period is gonna be within the first 50 miles.

 

Not before 1000 miles at least.
I'd keep it under 3500 rpm until ~1000 miles.
Or try gradually increasing the RPM's each time you drive.

 

I gotta disagree with that last statement especially when dealing with newer cars these days where they have the ringlands and rings placed so dam high on the piston

 

when i broke in my tc after 300 miles i was hitting 5000rpm.

 

I waited patiently for a good 800~1000 miles on the ODO, till I finally used my leadfoot to pound on the gas.