Synthetic oil caused lifters to go bad?

[Dave Weiss <dzweiss@worldnet.att.net> (by way of Daphne Gooding / John Jorgensen <stdynamics@northnap.citynet.net>)]

From: John Jorgensen
To: Glenn Kaufman <gkaufman@ftp.com> wrote:
I have recently switched to Mobiil 1.  Please explain the "sludge clean out
(Bilstein)" and the "lister-recommended short change."  I shall appreciate
this information.  I checked this out very carefully and the information I
got was that no engine cleaning was needed.  However I must say that Amsoil
sells a rather expensive program that involves engine sludge cleanout.
Thank you.
> What kind of evidence do you have for the synthetic oil causing the 
> lifters to go bad?  Has anybody else heard of this?

Might be coincidence, but my 200Q's lifters started clacking 4-5k mi
after switching from Pennzoil to Mobil 1.  This time, I had the sludge
cleaned out (Bilstein) and did the lister-recommended short-change
routine.  Insurance against changing 32 lifters.

Dave Weiss
'91 V8 5-spd
'93 90 CS