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I have just been advised against "flushing through" any oil systemn on the Accent due to the fact that the flushing fluids used could damage the internal bearings and seals.
The best method I've seen (which requires caution) is to run the engine for about 10 minutes to warm the oil up - hence making it thinner and run better, and then drain the engine / ATF - but BEWARE - the oil will probably be extremely HOT and may burn your skin so undo to drain plug with a spanner and let it fall into the container you put underneath - you can retrieve it later once the oil has all drained out and cooled down (it will stay warm for a while).
Being an Aircraft Engineer, we never flush an engine through with anything other than the oil that should be used in that engine. Any flush through / cleaning compound has the possibility of getting stuck in the bearings and preventing the lubricants from lubricating it for a while which can lead to failure of that bearing, and the engine. But please note, aircraft engines operate at a much higher RPM and for longer than car engines - so this kind of problem in a car engine will not be dramatic, but gradual, getting worse over years rather than 10 / 20 flights. So don't panic - my advice is to flush through with new, clean and correct engine oil.
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