Considering a 2000 or 2001 A4 avant

[Eric_R_Kissell@whirlpool.com]

Is this sludge issue mostly a question of dino oil versus a good synthetic
oil?

Has anyone heard of a sludge issue in a car using a good synthetic oil?

I would think with a good synthetic you could go longer than 10k miles,
though I would want to use oil analysis to verify that the oil was not
dirty or degraded before blindly running long change intervals.

YMMV,
Eric