Hi,

My Volvo s80 1999 2.9 Non turbo

Please see attached picture...donno whats going wrong from where this oil is coming through, my car is non turbo....oil cap seal is intact no leaks from there......any ideas will surly helpful.

Thanks

 

Usually oil leaks like this come from the PCV system. I don't know much about it but that it is usually the culprit for these issues. From my understanding it is much more common for turbo cars than non-turbos. So really I have no ideas but maybe it is a starting point.

They say if you start the car and put a rubber glove over the dip stick and it blowing the glove up it means there is a PCV issue. You can probably YouTube the video to find out more. I can't remember it off the top of my head.

 

Please view the picture, I change the upper mount last month and did notice that highlighted screw is not tightening and now upon close look up and check up....bolt is intact and in good shape but its not tightening properly....and oil is coming out from this bolt. Any advises.

@Stop_At_Willoughby- There is no PCV issues, changed year ago and checked now, all fine.

 

I think that mount bolt not tightening properly is a good clue. Since it is threaded into aluminum its very easy to strip due to overtorquing or crossthreading, and sometimes it just happens anyway because aluminum is so soft. The bolt actually passes through the valve cover, and into the cylinder head I believe. Because it isn't tight, you essentially have a valve cover leak since there is no valve cover gasket at that location, however there is a path for oil to move from inside the valve cover, up the bolt shoulder, and ontop of the engine.

If you remove the bolt and look closely at the threads down below with a flashlight, are they stripped? Are there any tiny metal pieces between the threads on the bolt? Also, this means you only have three bolts remaining supporting the upper engine mount.

If you look at the below URL, you can see your two upper engine mount bolt locations on the left side of the image. I believe the bolt you are concerned about is the "C" shaped location, and the leak is probably there.
S4 99 Volvo S80 Camshaft Cylinder Head Turbo Valve Cover | eBay

As a quick work around, you could remove the stripped bolt, clean the area best as possible of oil residue, and use Black RTV around the bolt shoulder and head. This RTV may be enough to seal the leak. You should also verify that the PCV system is functioning properly to reduce crank case pressure. Ideally, the best solution would be to use a helicoil kit and repair the damaged threads, however this may require removing the valve cover, not sure.

I hope this helps and best of luck!