I don't think he said they wouldn't do it, it said just they don't have a service manual (which is a bit strange actually). Most shops have Alldata or Mitchell On Demand, and the directions would definitely be in there. Most shops HAVE to have this service or else you can't fix anything.

Honeslty I wouldn't be shocked if they wanted no part of the job though...let's assume they've never done it, it's a big job, it'll tie up one of their bays longer than they'd like. They could be making money in that bay with less headaches. And let's say something's goes wrong - a possibility because they've never done the job - now they're either going to have to eat it, or charge him for it (and potentially lose him as a customer, or worse, he could go right to social media to complain). Shops are petrified of online complaints today.

The mounts on this car are a big/expensive/time consuming job. I'd turn it away if I owned the place. I'd rather have my guy's doing brakes, suspension, alignments and fluid changes. A couple check engine lights. Upsell a few things. I don't want an LS460 all apart on my lift with stuff breaking that I have to go to the dealer to get.