2010 engine break in period?

[RedRide]

Originally Posted by cdydjded

New cars do not require break-in periods. That is 1970's thinking.

Actually they still do.
Even though modern enging do not require the break in of old,
Engine parts still have to wear in together.

Engine parts also tend to wear in together better if the speed is varied a bit for the first 200 miles or so.

The prime reason why modern engine do not require break ins like in years past is because modern machine tools are much more precise making tolerences tighter. They still need to wear in together though.

I'm not getting into the how long a break in should be argument......I know better