Are Comfort Seats the solution to E350 seat issue?
1) Order yourself one of these sheepskin seat inserts.

Seat inserts
This is not the cure (but it will help). Next go to your local Michaels (or any craft or fabric store) and buy a few sheets of 1/2" medium density foam. Cut the foam to the contour of the center portion of the seat. (The easiest cleanest way to cut foam is with an electric carving knife. KMart sells them for under $20.)
Put your new foam insert on the seat bottom under the sheepskin. (The sheepskin both hides the unsightly green foam and also keeps the foam in place). Use the foam to elevate the center portion of the seat. Most seat pain is caused by the side bolsters being too steep and putting pressure on your outer thigh or low back. Use foam to create a more level surface. You may need two or three sheets to get the center of the seat bottom level enough with the side bolsters.
If the pain is low back, dial out all of the lumbar support to get the seat back as flat as possible. If you can't get it flat, use a piece of foam on the seat back that stops about 3" before the lumbar bulge begins.
Now drive for a good while, and see if it helps. Make adjustments. Forget about the cosmetics for now...the seat will look ugly... and just work on getting comfortable. Remember that often what makes a new car's seat uncomfortable is that your body has become acclimated to a different seat. Muscles shorten, ligaments set up a certain way, etc. It takes time for you to re acclimate, so the discomfort might recede slowly at first, but you should see improvement and continue to improve.
Eventually your soreness will have healed and you can start removing foam, and ultimately the sheep skin, although they're so damn comfortable you may not want to give it up.
Last edited by Mike5215; Jan 9, 2016 at 10:17 PM.
Your gray inserts look pretty nice.
Your gray inserts look pretty nice.
The old full sheepskin covers are hard to fit snugly on today's heavily contoured seats and they look pretty bulky and bad, but the inserts are pretty unobtrusive.
I just needed a way to build up the seat padding without it being an eyesore. It took a couple of years, and gradual reductions in the foam but I'm on just the regular seat now. But I can empathize with the OP. When it's bad enough that you want to dump the car, you're pretty frustrated and miserable.
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If it persists or worsens maybe talk to your Doc about a lumbar MRI.
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