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996 Oil Consumption

Engine

Vehicle Information: Model: Carrera 4S; Year: 2003; Body Type: Coupe; Total Mileage: 34,800;

Joel - My question pertains to normally aspirated 996 engines driven under a typical city/highway profile (not too wild and crazy in terms of speed, acceleration, and RPM). Why does "normal" oil consumption of such a contemporary engine, designed and built with high tech CAD/CAM and modern materials, have such a large acceptable variation? I have read many of your responses on this issue, as archived over the past years, and it seems that consumption less than 1 qt/600 miles is considered to be normal and acceptable. I could see why Porsche might state this high consumption rate as acceptable in terms of their warranty liability. Do you really regard this rate as being normal and acceptable?At the same time, with great inconsistency, Porsche states 7,500 - 12,000 miles as the recommended oil change interval. Many Porsche mechanics recommend a 3,000 mile interval, but even that would be way too long at 1 qt/600 miles, unless topped-off with a quart five times. One would have had to top-off with a quart 20 times over a 12,000 mile period.Here is my situation. I recently bought a 2003 Carrera 4S with 32,800 miles, and have been driving it for about 6 weeks and 2,000 miles. I had a pre-purchase inspection performed, and immediately upon arrival by container truck had a post-purchase 30,000 mile major maintenance performed by a "Premier" Porsche dealer. It has since lost or consumed 0.8 liters (0.845 qts), 4 of 6 clicks on the digital read out. It is hard to accept this as being acceptable and normal. What do you suggest I do?(Apologies if you get this more than once. The Web site is not acknowledging.)

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