That's the timing chain tensioners losing oil pressure.
replyAuto start/stop isn't off for enough time for the oil to drain from the galleries and especially not out of the bearing journals.
replyIt's the first few seconds after an engine has been off for hours (or worse, for potentially years) that are the problem.
I thought it pretty well established that auto on/off is bad for the engine, as is intermittently turning off some cylinders as some do. Is that wrong?
replyIt sounds like you're talking more about systems that supposedly disengage some cylinders while the car is cruising. Some engines with that kind of technology have been known to damage cylinders for multitude of reasons.
replyThat's very different from the start/stop feature they're talking about.
Note that that sentence is talking about the crankshaft bearings and their hydrodynamic lubrication, which is, well, elsewhere and separate from any cam rattle issues (including the cam phaser oil starvation that you might be referring to).
replyLifters also often drain while sitting and valve lash is greater at start until they get slapped a few times
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