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I have been a mechanic for over 20 years now, and have built and rebuilt both gas and diesel engines from a Briggs and Stratton to a 425 Caterpillar.There is no magical mile or time that an engine takes to "loosen up".This all depends on "how" one breaks an engine in.Noticeable power gains are the result of valves and rings seating and sealing the combustion chambers, making more power.Also, as the engine breaks in,the crank and rod bearings find tolerance,letting the rotating assembly to rotate more freely.Don't believe everything you hear on "the power block" every saturday or sunday afternoon,they're trying to sell you a product.There is no such miracle oil that will make a car feel that it has doubled in h.p.
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