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I believe there is some merit to internal combustion engine break-in procedures. We are talking mechanical parts that are moving under severe stress and need proper clearances that only can be achieved if the driver adheres to the guidelines as provided by the manufacturer. Why would Toyota/Subaru go through all this effort, time and expenditure to include this break-in procedure as written in the owner's manual of the vehicle if it doesn't have any benefit? I just like to err on the safe side and follow what the maker of my car says I should do for the first thousand miles of driving, it doesn't hurt to try and is what they recommend so why not? I drove my car with varying engine rpms and kept the revs below 4K for the first 1500 miles, then changed out the oil and filter for good measure. I have about 4500mi so far now and I still haven't revved the engine past 5K. I baby and love my car! If I were ever to sell the car, I would tell the buyer about how I babied the engine. Being on the other side as a buyer I would want to buy the car that actually took the time to allow for a proper engine break-in then one without....
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