1.8t oil pressure

[Arthur Marks]

Definitely sludge, but can't think of anything. Assume you changed the oil filter. My guess would be that you still had a lot of loose sludge, especially after working on it, and that it would block up the pickup but then drain clear of the new screen when stopped. My loss of oil pressure was completely due to the blocked pickup screen. It would take removing the head to completely eliminate it at once.

The problem with mine originated with the previous owner at only 24,000 miles (1st oil change was at 11600mi). I bought it at 36k and cleaned it up at 40k and have put on 50k mi without oil pressure problems or any obvious buildup under the valve cover. I'm running Mobile1 0W40 and have gradually increased the interval to 5000 miles. Once let it go about 8k on synthetic and upon cutting open the filter saw that the engine was making sludge.

Here's my documentation on the clean up: http://members.cox.net/ambox/audi_sludge/ If you have any points to add to that let me know.

--Art

  ----- Original Message ----- 
  From: Dan DiBiase 
  To: John Cody Forbes ; quattro at audifans.com 
  Sent: Thursday, September 02, 2010 12:51 PM
  Subject: Re: 1.8t oil pressure


  Sounds like the infamous 1.8T sludging issue...

   Dan D
  '04 A4 1.8Tq MT-6
  Central NJ USA






  ________________________________
  From: John Cody Forbes <cody at 5000tq.com>
  To: quattro at audifans.com
  Sent: Thu, September 2, 2010 12:45:15 PM
  Subject: 1.8t oil pressure

  I'm working on a '01 Passat AWM 1.8t. A few weeks ago it had no oil pressure so 
  I pulled the pan and replaced the pickup tube which was clogged full of crap. 
  While there I cleaned everything up a bit and also pulled the cams, cleaned the 
  head, and replaced all of the top end seals. Then reinstalled the pan, ran the 
  engine with crappy oil for an hour, pulled the pan, cleaned it out, cleaned the 
  pickup, and final assembled the car. When completed i verified plenty of oil 
  pressure. Yesterday while on an errand the oil pressure light popped on again. 
  Upon stopping the lodgers were clattering, so I knew it had no pressure at all 
  and promptly called a tow truck. 


  I drained the oil through a rag and found a bunch of fine black crud particles. 
  Pulled the pan again, but the pickup isn't clogged. Then I pulled the pump which 
  is in good shape and the pressure relief valve is not clogged nor stuck. 


  Any experience or ideas? Is there another relief valve somewhere down stream?

  -Cody (mobile)
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