2005 boxster s - buzzing sound at 3k?

[RandallNeighbour]

Jester, I followed the boxa.net link above and clicked on a bunch of other threads linked in that thread. Found this:

"Porsche in Frankfurt have 'admitted' the oil relief valves are at fault - and as a result are SPECIALLY making another one fit for purpose... they are at present not at the OPC's (to my knowledge) - so don't all rush out to get one fitted..."

You may want to inquire with your service advisor if this has been checked on your car as the source of the buzzing.

[mrsparkle]

I just checkout the post myself.

Didn't know they updated it.

If you read further down in the post it states possible reasons why the rattling occurs.

"I think the sound is likely cavitation, which basically occurs when a pump is pressurizing oil with air in it or theres not enough oil feed to a pump. If the relief valve is opening too early or too much in cold running (ie higher viscosity oil which = higher pressure, and also reluctance to flow into the pump) its possible the pump is being starved of oil, or being fed oil with air in it.. The air is compressed (assuming for the mo that oil is incompressible) and implodes which over time will diesel (or burn) the oil, and will reduce the oil life, increase the acidity of the oil and damage components, making matters worse...

When cavitation occurs (particularly on leading edges of pressure equipment, ie pump lobes/gears) the material in these areas is damaged causing a drop in performance and "sealing" making the matter progressively worse. This may explain why a new oil pump helped for a short while, but eventually the problem came back..."