Only applicable on U.S. version/specification cars! Does not work on EURO, Japan or whatsoever country versions. This was/is mandatory on U.S. cars only:

http://tweakers.net/ext/f/hR59aPCwiH...Ny4Lg/full.png

note the remarks for the M70 V12 engine, first 6 cylinders 5 x stomping, second cylinder row 6 times!