News2 mins ago
why don`t cars have to be "run in " anymore
Why can you drive new cars at fast speeds without it damaging them and making them sluggish.
On the same point does it damage a new car to drive it for the first 1000 miles at a lower speed
On the same point does it damage a new car to drive it for the first 1000 miles at a lower speed
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For more on marking an answer as the "Best Answer", please visit our FAQ.In olden days, manufacturing tolerances were not what they are on today’s engine parts (pistons, bores, bearings, journal sizes, gear teeth etc). Natural wear of the parts (by running in slowly) improved the mechanical ‘fit’ of the parts – and resulted a longer engine life. Thrashing a new engine could result in damage due to the moving parts not being as good a fit to one another as they otherwise might be.
That said, I would still advise keeping the revs on a new or reconditioned engine below 4,000 for the first 1,000 miles or so, to increase the life of the engine and minimise unnecessary wear.
That said, I would still advise keeping the revs on a new or reconditioned engine below 4,000 for the first 1,000 miles or so, to increase the life of the engine and minimise unnecessary wear.
It was a common sight until the mid-sixties to see a car with the sign, "Running in - please pass", stuck to the back. Although the message was valid, the subtext read, " I have to drive this slowly because I've just bought a brand-new car and I don't want to collide with your second-hand jalopies, thank you very much, poor people!"
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