My wife's Z4 with the M54 had the vanos seal issue. The fix was relatively easy and only took about four (4) hours from start to finish when I performed this repair several years ago.
Removing the DISA takes about 20 minutes, maybe.....
How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams