My Saitek X52 Pro is only a week old. Still, I did notice the need for lubrication at the plastic/metal interface (I don't know if the X52 Pro is built exactly like the Evo).
I used Moly Disulphide (Molybdenum Disulphide, MoS2). Its the premium dry lube -- perfect for this use. BUT, it is usually hard to get in small quantities and expensive. I keep it around because its the best. Google for suppliers.
http://en.wikipedia.org/wiki/Molybdenum_disulfideI assume dry powder graphite lube (as used on Pinewood Derby cars) would work almost as well. Its a general lubricant for many purposes and is more readily available (however, I have not tried it for this purpose). Google for suppliers.
http://www.drillspot.com/products/346351/Tube-O-Lube_31644G_Dry_Powder_Graphite_LubricantSilicone grease could do the job -- and not attack the plastic. Its a great "wet" lube -- the best for many uses. The downside is dust collection (as with any "wet" lube) -- that is mitigated by using the most microscopic layer (don't goop it on). It too is available in small/expensive quantities. BTW, Moly Disulphide grease would have the same dust collection problem (but Moly is best used dry where possible). I keep silicone grease in my home shop too -- but have not tried it on the Saitek.
I am also deciding on what lube to use on the center-post where the metal washer spring mechanism rides up and down the metal post-- haven't picked one yet -- probably will pick something out of my lube-box that goes in as a liquid (to get between the washer and post) and subsequently "dries". Nonetheless, I imagine a wet lube would work OK there if dry were not available.
BTW, lubrication is not a "Saitek Problem" -- virtually all mechanical surfaces that rub benefit from lubrication -- just has to be the right kind for plastic and rubber or it can cause more problems than it solves.
P.S. To apply Moly or Graphite, first clean off all oil, wax, etcetera and dry the surface. The surface needs to be perfectly clean -- then the dry lube bonds with the surface material (metal or plastic) and will not wipe off in use. Do not mix dry lube with oil or grease as it defeats the primary dry lube benefits.
P.P.S You got me thinking. So, I completed my lube job. I was able to apply the Moly dry lube to the center post and the flat sliding surface the post sticks out of. I used a q-tip cotton swab. All lubed up now.