My idea of a perfectly healty engine is no oil consumption, at least not
noticable during the normal serviceinterval (10.000 km). Usually car
manufacturers say anyting up to 1 liter per 1.000 km is acceptable.
I would say that anything more than 1 liter per 5.000 km is an indication
of some kind. Either a 'sporty' drivingstyle or a worn engine.
I once had a consumtion of 1 liter per 500 km in the Citroen 1.8 8v engine.
This is still acceptable if you want to spend the money on the oil as the
engine did not smoke or run any worse. Problem was eventually fixed by
fitting new worn valverubbers.
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