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Originally Posted by JinnKai
VERY untrue. Mechanics and people with the longest running cars (200,000+ miles) recommend checking your oil every 500 miles or less. It is the most important fluid in your engine, and changing it early can be very necessary. I live on all dirt roads, and the excess dirt that I stir up when driving easily gets into my oil -- turning it BLACK in under 2000 miles. Oil is not supposed to be black.
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A few years ago Consumer Reports tested various oil brands, weights, and frequency of changes. They installed identical newly rebuilt engines in NYC taxicabs and then ran them for two years, averaging over 60,000 miles each. Two different schedules were used, 3000 and 6000 miles.
At the end, they removed the engines, broke them down and compared them for wear on parts lubricated by the engine oil, and found no difference whatsoever provided by the more frequent oil changes (or for that matter, different brands).
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Important to note -- STOCK. Unless you're using the tires provided with a new car from a dealership, odds are that they are not the stock tires. Only these are properly measured for weight distribution of your car, and new tires can see dramatic performance increaes or decreases if you do not use the tire's recommended pressures.
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The point was that many people tend to look at the pressure on the tire and assume that that is the proper pressure for that tire. It isn't, it's the MAXIMUM, which could actually be dangerous, and a lesser pressure if it is within the tire's safe range won't cause any damage.
So long as the replacement tires are the same size as the stock tires, the manufacturer's recommended pressure is still best, and will very likely be within the safe range for the tire.
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