10-21-2011, 10:32 AM
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#10 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3596
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Quote:
Originally Posted by Red__Zed
It's 1200 and it's all warranty-denial crap.
If you build a new engine and don't run it out at all in the first 1200 miles, it will likely fail catastrophically. Luckily, Nissan does this for you.
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I think beyond warranty denial, they're also trying to cut the new-car accident rate. Getting most consumers to "go easy" on the car for a while at first will cut the rate of people who get on the car hard before they've learned to feel the car's reactions and know its capabilities, which leads to those low-mileage catastrophic wrecks.
But I agree with Red, as far as real engine break-in is concerned: (a) the factory has done it for you, and (b) if anything, if the engine *wasn't* fully broken in, you don't want to be too soft on the engine early on. The main thing with break-in on a modern engine is piston ring seating/sealing, and you want to make use of the cross-hatch score-marks on the cylinder walls to properly abrade the rings under stress conditions before the score-marks are worn smooth from regular driving.
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