How important is break in ?

Cyber370

I know this for a fact. I bought a used 6-month old Mustang back in 2010 that was previously a rental car. I can guarantee that no break-in was performed. It has been the most reliable car I've ever owned. The engine runs like a top and consumes no oil between oil changes. I now have 130k kms.

Keep in mind that if break-in was indeed very important, manufacturers would program it into the car's ECU restricting rpm for the break-in mileage and requiring an oil and filter change right after.

I'm not saying it isn't a good practice to allow a break-in period, but i don't believe it is vital for reliability/longevity of the engine in modern cars.

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