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Message: Sudden high oil consumption/loss (9A1 3.4L)

Changed By: Laz
Change Date: April 11, 2015 04:19PM

Sudden high oil consumption/loss (9A1 3.4L)
About a month ago I had the dealer do the 40k service which included changing the oil and spark plugs. Up until then I'd have to add maybe up to a quart between 5k changes, always using Mobil 1 0-40 with the A40 spec. Not to absolutely imply it had something to do with the service, but I've incrementally added oil totaling about 1 quart in 733 miles. Other than this, the car is asymptomatic: runs well, no smoke, dry tailpipes, idle pressure is the same as always, & Porsche specified no less than 51 psi at 5000 rpm. I cannot detect any external leaks: no oil on the driveway even with the fully warmed engine running for several minutes and intermittently revved. The bottom of the engine is dry, (including at the drain plug, the original of which had cracked on a previous service.) Nothing on whatever I can see of the sides including a couple of the spark/coil locations. Wherever I can feel the inside of the belly panel near the engine is dry, too. Nothing on the garage floor.

I emailed the dealer with the above information and then spoke with them on the phone. They told me as a first step to let the level drop to the "minimum" mark and bring it to them, and they'll top it off there. I imagine they'll document the mileage, and I'd hope they'll rack it to check for external leaks at least.

Been checking at every valid, level stop, and just today at 107 miles, it looks like it's down 1 increment again! As the 4 between min and max equals ≈ 1.8 quarts, this means the motor is already ≈ .45 quarts down.

Being this has been happening since the spark plug change, I've wondered about the tubes leaking, but as I've said, I see no signs of an external leak. Oil filler tube?

Anyone have any insights? Thanks, Laz.

Original Message

Author: Laz
Date: April 11, 2015 04:12PM

Sudden high oil consumption/loss
About a month ago I had the dealer do the 40k service which included changing the oil and spark plugs. Up until then I'd have to add maybe up to a quart between 5k changes, always using Mobil 1 0-40 with the A40 spec. Not to absolutely imply it had something to do with the service, but I've incrementally added oil totaling about 1 quart in 733 miles. Other than this, the car is asymptomatic: runs well, no smoke, dry tailpipes, idle pressure is the same as always, & Porsche specified no less than 51 psi at 5000 rpm. I cannot detect any external leaks: no oil on the driveway even with the fully warmed engine running for several minutes and intermittently revved. The bottom of the engine is dry, (including at the drain plug, the original of which had cracked on a previous service.) Nothing on whatever I can see of the sides including a couple of the spark/coil locations. Wherever I can feel the inside of the belly panel near the engine is dry, too. Nothing on the garage floor.

I emailed the dealer with the above information and then spoke with them on the phone. They told me as a first step to let the level drop to the "minimum" mark and bring it to them, and they'll top it off there. I imagine they'll document the mileage, and I'd hope they'll rack it to check for external leaks at least.

Been checking at every valid, level stop, and just today at 107 miles, it looks like it's down 1 increment again! As the 4 between min and max equals ≈ 1.8 quarts, this means the motor is already ≈ .45 quarts down.

Being this has been happening since the spark plug change, I've wondered about the tubes leaking, but as I've said, I see no signs of an external leak. Oil filler tube?

Anyone have any insights? Thanks, Laz.