The BMW Z3 is a modern cult classic that has an incredibly enthusiastic group of owners. The Z3, based on the E36/7 chassis, was made from 1996 to 2002, when it was finally replaced by the Z4. The Z4, while popular, has failed to generate the same level of adoration as the Z3. The Z3 was produced over its seven-year production run at BMW's Spartanburg, South Carolina plant. The model has proven quite reliable with the proper maintenance. This guide does not cover the more specialized M Coupe and Roadster.
The Z3 came with several different motors. 1996 to 1998 models came with the 1.9-liter M44 inline-4. This motor produced 138 horsepower. It has proven to be nearly indestructible. The M44 is based on the M42 that came in the E30 318is. The 1999 to 2000 Z3s came with the 170 horsepower 2.5-liter M52 inline-6 and the 2001 to 2002 models came with the 2.5-liter M54 inline-6.
From 1997 to 2000 buyers could also opt for the 2.8-liter M52 inline-6 and from 2001 to 2002 for the 3.0-liter M54 inline-6. All Z3 motors have proven reliable with the proper oil changes and tune-ups.
A tune-up should include an oil change, new thermostat, spark plugs, air filter, new valve cover gaskets (leaking valve covers spill oil onto the plug wires and plugs) and a fuel filter. The timing chain should be changed every 60,000 miles or every four years, whichever comes first.
Like many BMWs, one area that needs to be paid special attention to on the Z3 is the cooling system. The water pumps, thermostats and radiators can all be problematic. BMW specialists recommend a new water pump every 60,000 miles and a new radiator at 100,000 as preventative maintenance. The coolant should be regularly checked and flushed on occasion.
Differential fluid should be checked. This area is usually problem free, though some gearboxes have been known to lose the detent on the fifth gear. The gearbox needs to be removed for this to be repaired. The water level on the Z3's battery needs to be checked to ensure reliable charging. The fuel gauge sending unit is a common problem area with Z3s. New senders can be installed, but regular use of fuel additives to keep the fuel clean is recommended as preventative maintenance.
Many Z3s suffer from problems with their power windows. New switches are usually required. Though it is not related to general maintenance, the rear floor can fail when the welds around the differential and frame areas of the rear floor crack.
