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Before
changing the oil, pour the contents of a box of Internal
Engine Cleaner into the sump with the engine still
hot. One box is enough for up to 4 litres of oil
by volume. Double the dose for greater volumes. Allow
the engine to idle for between 5 and 10 minutes. Drain
the oil form the sump while it is still hot. Change
the oil filter before topping up again with fresh
oil. Ideally, the treatment should be repeated before
every oil change.
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