Quote:
Originally Posted by Poodles
Modern engines are 99.9% broken in, so changing the filter or oil isn't needed. Plus, the original fill is usually very high in moly and the filter (at least on Toyotas, dunno on Subaru) are a special unique filter specifically for the break in. You're more likely to cause excess wear by changing the oil too early in this case.
Try to keep it under 4K for 1K miles. I say try because on an automatic car it would be impossible to do it so just try not the beat on it or stay at the same RPM for long periods of time.
Remember, fully seating the rings takes engine braking and this will also work to break in the transmission and diff (instead of just breaking in the drive faces, it breaks in both).
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I get that the original fluids are there to assist in handling any flaws in production and assist in the break in period, the reason I want to be persistent with changing fluids is it's not uncommon to acquire shavings or other pieces of debris in the filter/oil within the first couple hundred/thousand miles. I'll see if I can make it to 2K miles but I won't drive the car very hard with whatever it came with.