997.2 Oil Consumption
10-18-2009, 02:40 PM
#121
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Mine has approx. 5000km now. I have seen oil consumption start at about 1lt/1000miles and then drop consistently as i piled on more miles. It is now approx. 1/3 lt / 1000miles.
Oil consumption is to be expected in a DFI engine because of higher combustion temperatures - higher allowances between rings and cylinders. Not to worry but should drop as engine breaks in and stabilise at about 10,000 miles.
Oil consumption is to be expected in a DFI engine because of higher combustion temperatures - higher allowances between rings and cylinders. Not to worry but should drop as engine breaks in and stabilise at about 10,000 miles.
10-18-2009, 03:42 PM
#122
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Only 900 miles so far on my 997.2 C4S. One bar down as of a week ago. 80% of my driving has been local (non-freeway) commuting, which means sitting in a lot of LA street traffic. I hope this isnt killing my engine.
10-18-2009, 04:53 PM
#123
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As far as the reason for oil consumption, I was told by my service tech that it is inherent in a flat engine, as in the law of physics. Oil tends to collect at the lowest point, which means the length of bottom side of the cylinder. Made sense to me!
10-18-2009, 05:14 PM
#124
Three Wheelin'
Random.
10-19-2009, 05:54 PM
#127
Nordschleife Master
10-19-2009, 05:57 PM
#128
Poseur
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What I do believe, however, is that these modern engines with the harder steels in them, may take an extraordinary amount of miles to finally get broken in. Be patient. It could be as high as 50,000 miles.
It's an odd problem because the vast majority of these engines do not use oil. But there is always a small percentage of them that do. If Porsche knew the reason they would have resolved it. They have no clue yet.
OK, you win!
10-19-2009, 07:38 PM
#132
Poseur
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Although his may be a wholly different engine, the ring and valve business has not changed in its role on these things. Thus, we continue to see excessive oil consumption on both the 997.1 and the 997.2 DI engines. If they had made a change to the new engines taking the valve area out of the equation, we might have something here. But they couldn't. My 997.1 3.8 engine was bore scoped (each cylinder) for unusual scratches or anything else that could lead to excessive oil usage and nothing was found. On the 997.1 engines there is an oil separator that somethings becomes problematic, leading to much soot on one vs. both pipes. Can't say if that area of the engine continues to be an issue with the DI engines.
10-20-2009, 08:46 PM
#133
Rennlist Member
Although his may be a wholly different engine, the ring and valve business has not changed in its role on these things. Thus, we continue to see excessive oil consumption on both the 997.1 and the 997.2 DI engines. If they had made a change to the new engines taking the valve area out of the equation, we might have something here. But they couldn't. My 997.1 3.8 engine was bore scoped (each cylinder) for unusual scratches or anything else that could lead to excessive oil usage and nothing was found. On the 997.1 engines there is an oil separator that somethings becomes problematic, leading to much soot on one vs. both pipes. Can't say if that area of the engine continues to be an issue with the DI engines.
Finally got bad enough that PCA authorized removing the heads and checking the valve seals. With the heads off they found badly scored piston(s). #6 was especially bad, which might explain extra soot on the drivers side. Luckily, I was on the last weeks of my CPO and now have a rebuilt engine. I have no idea how the pistons became scored.
10-20-2009, 09:38 PM
#134
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850 miles on my 09 C2S and I have used about 1/2 quart. Lots of soot in pipes and on back bumper. A real pain in the A_S on a white car. I have not babied the car and when fully warmed it saw red line while pulling out on the highway the other day. I think there was a cloud of black smoke that came out of the tailpipes when I opened it up. Driving these cars really slow cannot be good. I think it just makes the soot problem and oil usage worse IMHO.
10-21-2009, 12:20 AM
#135
Race Director
gjnockie, correct the higher rpm's you drive the less soot as I have discovered during my track events. Personally I do not feel that the ECU is programmed very very rich under normal driving.
As far as oil burning I believe that the tolerances in these engines really are not that exact and oil is getting by the rings.
The manufacture-build quality and consistenacy has issues and Porsche is trying to push all this under the carpet. I truly feel this way every month. The more oil I add and every week the soot I wash off the rear of the car makes me less and less of a Porsche fan.
As far as oil burning I believe that the tolerances in these engines really are not that exact and oil is getting by the rings.
The manufacture-build quality and consistenacy has issues and Porsche is trying to push all this under the carpet. I truly feel this way every month. The more oil I add and every week the soot I wash off the rear of the car makes me less and less of a Porsche fan.