Quote:
Originally Posted by Peter Zimmermann
Correct, consumption, according to Porsche, is acceptable down to a quart per 600 miles; but the "norm" that makes most owners comfortable is a quart/1K miles. My shop kept to the rule that if a 911 (this was mostly the case with 3.2 liter cars) reached a consumption rate of a quart/300 miles it was time to take it apart.
The suggestion above, to follow the car and with the engine warm hold the engine at 4-5K revs for a city block, then decel by removing your foot from the gas, is excellent. I've done this a hundred times, and it removes some of the pressure to get an honest answer from a seller (and sometimes a seller doesn't honestly know).
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Peter,
Why do you think Porsche specified 600 miles/quart? Would your engine really be OK if it was using that much oil?