Well, my first goal when I bought my Bonneville back was to replace/repair all the main parts (drivetrain) that are known to be problematic for these cars. One thing left to do: the lower intake. Gonna do that this weekend. Here'* what I've done so far: (currently has 109k)
1) New upper intake manifold
2) New water pump
3) New radiator
4) Changed all fluids and filters
5) Aligned front suspension
6) New Goodyear Integrity 225/60/16 tires
7) New Cradle bushings
8.) New fuel Pump
9) New Platnum plugs
10) New Delco plug wires
11) New ignition coils (Delco) and ignition module
12) New oil sending unit
13) New Delco battery
14) New oil pan gasket
If anyone would like to suggest anything common to break that I missed, please do.
This list does not include exterior/interior repairs. I would have done the LIM'* when I did the upper manifold but I was on a time constraint.
After I do the LIM'* I think the only thing I'll need to do for a loooong while is change the oil. I will eventually change up to 1.8 or 1.9 rockers, and some headers.