New 342 - no linked peddle, and first regen just occurred (with no issues) at 20.1 hours. I know you specifically asked about the S-HST linked peddle - but I thought I'd add my experience here. I work in the DPF industry- and for active DPF's, they are usually both time and/or back pressure based scheduled regens. My LS is an active system, so the 20 hour mark makes sense as a timed regen (vs a back pressure based regen). I've been running at 1500-2000 rpm for light loader work and 2200 rpm for heavier work. Only 25 hours so it's too early to tell how that's going to work out for me, but so far getting a timed regen (I'm assuming that due to the clock coincidence) is a good sign.