ATF to quiet lifters?

[Peter Kirby]

A friend recommended that I use automatic transmission fluid (ATF) as a
penetrating oil to get a tie-rod end off.  It seemed to work great.  While
somewhat dubious of his suggestion, I did a search on the net re ATF and
found people recommending it to silence hydraulic lifters:  drain a litre of
engine oil and replace it with a litre of ATF.

Anyone try it on the Audi engine?

Peter