I bought a 2005 S4 Dolphin Gray Cab in January with 78,000 miles
I love my S4, but they sure are maintenance hungry. One of the more interesting problems that I got was a low oil light on within 500-1000 miles every time, sometimes a lot less. Eventually, a red flashing "Low Oil Pressure" light came on to warn me of my engine's near-death. Then it went off. Then back on. Then off. All in the matter of seconds. Keeping the oil topped off sometimes kept red oil pressure light away, but it always came back very quickly, and interestingly as well, restarting the engine sent the light away until i started driving. Or so I thought, when trying to determine was was triggering this low oil pressure light when finally resolving the issue, I found that it went off everytime the car accelerated to 2200rpm or higher, and would usually stay on at the point. Decided it was time to pull the sensor and replace it. $7 later on a VW/Audi oil pressure sensor from ebay, i pull off the old sensor to find it covered in oil and disgusting. Replace it, boom, car fixed, runs fine. Now, nearly 10k miles later, i have added a quart of oil to my car maybe 2 times over those 10k miles. I figured my engine was almost gone from cylinder scoring but now I'm hopeful I might have a survivor.
Sensor replaced: 82500
Current Mileage: 91005.
Moral of the story:
The oil pressure sensor can leak very significant amounts of oil, therefore making it seem that your engines are burning more oil than they actually are. This part is worth glancing at/replacing to help reduce oil loss on all high mileage high oil consuming engines.
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Originally Posted by jmcS4
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