Hey all, hoping some of you can help me diagnose and address some concerning noises that have started occurring on my '98 base Boxster with ~91K miles.
Issue #1:
- My Boxster has recently developed a ticking/tapping noise on the driver side cylinder bank after the car is fully warm. The engine sounds normal until I have been driving for ~15 mins and then this noise starts. From my reading on other posts, this seems to match the noise caused by a stuck lifter. However, there have been varying reports of different oil addressing the problem or other solutions. I am running LiquiMoly 5W-40 right now. I read about switching to a higher viscosity oil could help older engines like mine, should I switch to something like a 15W-50? (I've also read that a lower viscosity oil could help, so not sure which direction to go here).
Video of issue
Issue #2:
- Another recent development is a loud high pitched squealing noise seemingly coming from the passenger side. This only occurs when I am off-throttle & decelerating after the car is warm. This seems to be the same or similar issue as
this thread. I just replaced my AOS a year or so ago due to some smoke issues I was having on start up. Could it really be bad again and causing this noise?
-tWv- 
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