The effects of gasoline composition doped with a trace amount of used engine oil on the formation of simulated intake valve deposit have been investigated. Studies were performed using a bench top simulator. Oxygenated gasoline has been found to exhibit a high deposit-forming tendency. In addition to the amount, the nature of the deposit formed also depends on the type of fuel used. For oxygenated fuel, a dry carbonaceous deposit is usually formed instead of the polymeric deposit that is commonly obtained from non-oxygenated fuel.
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