I haven't put a watch to it, but seat of the pants I'd say it's definitely under 15 secs, for sure if I'm using S instead of D. She pulls about 2900rpm at 65mph in 4th. At a Florida hot idle after running 60mph+ for ~20mins, the oil pressure sits at 1.8. It's actually pretty quick now that I've performed about five years worth of maintenance on it in the last six months. Primary helps though were cleaning switchover lines, valve adjust, new filters all around, new vacuum X and Y connectors by the IP, and running some DP through it. In addition to checking the timing I opened it up this time to also check that the #1 cylinder valves were holding there setting after a week of running hard, and they are. I adjusted them several months ago but decided to check-up on them a couple weeks ago. The #1 cylinder intake was at .055 and the exhaust was closed so bad I think a .127 barely fit. Must have not locked the nuts tight enough on that one (or...?). Only one other valve needed a minor tweak.

She goes like hell, just has a steady thwack-thwack-thwack when at hot idle. Any rpm makes it go away, or so it seems so far. Just tuned in to really listening closely in the last few days and she's been apart for 36 hours now. Shakes a bit more than I think it should at hot idle too fwiw. Did motor and trans mounts but not engine shocks, helped some. Haven't messed with the rack dampener yet. She _really_ likes the DieselKleen, runs noticeably smoother and stronger with healthy dose of it. From the look of the injectors they've never been touched, which is what led me to investigating the sound as nailing, if that's what it actually is.

__________________
1984 300D Light Blue/Blue
2006 C280 Silver/Black