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Old 01-08-2013, 01:28 PM
MouseFink MouseFink is offline
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If a catalytic converter is blocked on a high mileage engine, the exhaust back-pressure at highway speed can by-pass the rings, over-pressure the oil pan and cause the engine puke oil out the dipstick tube or any openings that are open to the atmosphere.

In 1984, my daughter's 1978 Firebird did that when she was using leaded premium gasoline. The leaded gasoline stopped up the catalytic converter. There was some leaded gasoline still available at the pump in 1984 and was gone completely by 1986.
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