  Using an operator product expansion (OPE) approach an updated Standard Model
prediction of the $B_c$ lifetime is presented. The computation in three
different mass schemes for the heavy quarks leads to three different values
consistent with each other and with experiment. Furthermore a novel way to
compute the $B_c$ lifetime is presented, taking differences of $B,D$ and $B_c$
meson decay rates. In this approach the leading contributions from free-quark
decays cancel out, leading to a reduction of scale and scheme dependence.
