A 94 E320 can cost anywhere from $1000-2000 per year to maintain properly.

Engine, transmission, body can go well over 500K miles but there are some weak area's.

eg. for a 94 E320 some common failure items

Evaporator $2000.00
Headgasket $2200.00
AC control unit $300.00
Wiring Harness $650.00
60K mile service $700.00
Aux Fans $350.00
AC mono valve $300.00
Air flow sensor $300.00
Alignment $140.00
Engine computer rare failure $2100.00
Electronic throttle $1500.00
OVP $70.00
Fuel Pump Relay $25.00

Toyota is cheaper to operate.

If the items listed above have been replaced with redesigned components, then the operating cost can be somewhat lower than the $1000-2000 range.

__________________
Zafar
94 E320 58000 Miles