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I've had to replace my low oil pressure switch just recently as it went out and I thought that was causing a lifter noise issue and that the oil was not getting to the valves fast enough during start up (because the noise will go away after you gun engine a couple times). However, to diagnose this, I finally bought a cheap auto stethoscope and started it cold after having removed the plastic engine cover. The noise started immediately so I put the scope on the valve cover and it sounded smooth. Then I moved to the rear manifold and heard the noise a little louder but it didn't seem to be emanating from there so I then moved the needle down to the passenger side of the engine on the timing cover and "clickety, clickety' clickety....and it was very pronounced. Could hear more tapping on the back side of the cover near firewall vs. front.
Once I got the oil pan cover off, the oil strainer screen was pretty gunk-ed up so that could be your problem but oil pumps typically last the life of the engine or close to. You can see it in the second video like an upside down singer's microphone. Replace your oil pressure switch. They definitely go out around 90-110K without fail. Everything in this car explodes at a certain mileage that is for sure...just like my old Mercedes Benz, but these are tougher to repair due to no room!!!
I also did my right front axle shaft, oil pan and oil mount seals, and my water pump (only about a $70.00 part and you DO NOT WANT TO DO THIS JOB AGAIN SHORTLY!!!).
Let me know if you have any other questions. Hope that helps!
BTW. this is my wife's car. I just got a new BMW 335i which is also SWEEEEEET!!!! But man, is that engine compartment TIGHT!!!!
Last edited by sptt144; 10-09-2012 at 02:19 AM.