I have rechecked the compression, this time using the prescribed manner, with all sparkplugs removed, and with the throttle wide open. All eight cylinders are in the following range: 169-175 psi, most of them are closer to 175. Can someone give me a reference/link where I can find the correct compression specs for a 1987 560SL ?

Also, I noticed on a couple of the spark plugs what appears to be some fouling, perhaps due to oil. I am guessing that I will need to replace the valve seals as this is now a 21+ year old vehicle.

Is there someone out there, from whom I can rent the necessary tools to compress the valve springs ? Also, are there any other special tools I will need to do the job (valve seal replacement) ?

BTW, the cam lobes all appear to be shiny, with only minor scratches/abrasions. I can't seem to find anything wrong with any of the rockers/ball studs either.

Question, when I do the valve seal replacements, is there anything special I can do to make sure all of the rockers/ball studs are within tolerance & functioning propoerly ?

Thanks in advance,

Brian