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Usually back pressure is caused by worn piston rings, combustion gasses passing the rings into the sump, there are also some engines which have positive oil pan ventilation trough the air filter with a suction pipe (BMW engines)Back pessure goes hand in hand with light blue smoke and lack of compression.

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13y ago
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16y ago

Odds are it's a blockage in the exhaust. (and if you have a catalytic converter ... most likely culprit.)

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Q: What causes engine back pressure?
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