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Old 09-26-2012, 03:32 PM
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Petroleum oil naturally causes seals to swell. Years ago when people would change from petroleum oil to synthetic they would get massive oil leaks because the seals would shrink. This is where synthetic oils got the reputation for causing oil leaks. New synthetic oils have additives that cause seal swell, like petroleum oils, so oil leaks from synthetic oils are uncomon now.
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