Transmission, interior/exterior trim falling off, rust.
Will probably last forever.
I had a 1979 olds custom cruiser wagon based on the chev malibu wagon. it had a 305 4-bbl and I loved it. ran good and strong, the lining on the roof sagged also. it was rusty, but very reliably. I finally got rid of it when the odimeter hit 420,000 miles.
The "Custom Cruiser" the first commenter referred to is/was actually called the Oldsmobile Cutlass Cruiser. That model was based on the Chevy Malibu Wagon. The (full size) Olds Custom Cruiser was based on the Chevy Caprice & Impala wagons, Buick Electra Estate Wagon, Pontiac Parisienne Safari wagon, etc.
Just wanted to politely clear that up.
I currently own a 1979 Cutlass Wagon. I've been driving it since 1979 and only replaced the motor after 300,000 miles because I had some extra cash. The 400 metric trans had to be rebuilt after 150,000 miles. That didn't last long and I put a rebuilt 350 TH and have had no problems since. I have an ongoing problem with rust on the doors and rear lower quarter panel. I have always trusted my car to take me anywhere and wish I could buy another new one.