Here is my almost-complete list of things that I have replaced or added to my 1991 318is.. I did not add seals or gaskets to the list for the most part, because I just think that it's common knowledge to replace such things when doing work on a car. (For example, valve cover gasket when I had it powdercoated, etc)
With that said, depending on the maintenance history of your car.. these would be a good place to check up on to see if they need to be replaced.
Mods:
Mark D 93 Octane Chip
BBS RS 039/040 Staggered Wheels
M-Tech Illuminated Shifter
M-Tech 1 Steering Wheel
Front/Rear Strut Bars
Pioneer TS-D502P 5x1.25 Rear Speakers
Pioneer TS-A532P 5x1.25 Front Speakers
Pioneer TST15 3/4" Tweeters
Pioneer Premier DEH-P310UB Head Unit
Bilstein Sport Shocks (July 2010)
H&R Sport Springs (July 2010)
Diverse Motorsport 15mm Drop Hats (July 2010)
20% Charcool Lifetime Warranty Tint
K&N Air Filter
Euro License Plate
OEM BMW Mud Flaps
GG Interior Light Delay
Powdercoated Intake Manifold/Valve Cover
Deleted Power Steering (powersteeringdeletes.com)
Maintenance:
New Behr Radiator (April 2011) (145,000)
New Upper and Lower Radiator Hoses (April 2011) (145,000)
New Thermostat (April 2011) (145,000)
New Meyle Front Wheel Hubs (April 2011) (145,000)
New Powerflex Rear Subframe (February 2011) (144,000)
New Powerflex Rear Trailing Arm Bushing (February 2011) (144,000)
New Powerflex "Race" Differential Bushing (February 2011) (144,000)
New CV Boots (February 2011) (144,000)
New Bosch O2 Sensor (February 2011) (144,000)
New Pinion Seal (February 2011) (144,000)
New OEM Front/Rear Brake Lines (February 2011) (144,000)
New Rear Swaybar Links (February 2011) (144,000)
New OEM Steering Rack (September 2010) (142,500)
New Front/Rear Shock Mounts
New Odometer Gears (December 2010)
New OEM Hella Interior Light (August 2010)
New Fuel Filter (July 2010)
New Control Arms (July 2010)
New Tie-Rod Assembly (July 2010)
New Polyurethane Control Arm Bushings (July 2010)
New Front Sway Bar Links (July 2010)
New Timing Chain Tensioner (March 2010)
New Oil Filler Cap (March 2010)
New 4-Pintle Bosch Fuel Injectors [Part #:0 280 155 710] (September 2010)
New OEM Bosch Spark Plugs (September 2010)
New HQ Autosport Coil On Plug Kit (September 2010)
New Zimmermann Front/Rear Cross-Drilled/Slotted Rotors (July 2010)
Fixed the "Mess Under The Intake" (September 2010)
Royal Purple Differential Fluid (July 2010)
Crack Free Dash (December 2010)
With that said, depending on the maintenance history of your car.. these would be a good place to check up on to see if they need to be replaced.
Mods:
Mark D 93 Octane Chip
BBS RS 039/040 Staggered Wheels
M-Tech Illuminated Shifter
M-Tech 1 Steering Wheel
Front/Rear Strut Bars
Pioneer TS-D502P 5x1.25 Rear Speakers
Pioneer TS-A532P 5x1.25 Front Speakers
Pioneer TST15 3/4" Tweeters
Pioneer Premier DEH-P310UB Head Unit
Bilstein Sport Shocks (July 2010)
H&R Sport Springs (July 2010)
Diverse Motorsport 15mm Drop Hats (July 2010)
20% Charcool Lifetime Warranty Tint
K&N Air Filter
Euro License Plate
OEM BMW Mud Flaps
GG Interior Light Delay
Powdercoated Intake Manifold/Valve Cover
Deleted Power Steering (powersteeringdeletes.com)
Maintenance:
New Behr Radiator (April 2011) (145,000)
New Upper and Lower Radiator Hoses (April 2011) (145,000)
New Thermostat (April 2011) (145,000)
New Meyle Front Wheel Hubs (April 2011) (145,000)
New Powerflex Rear Subframe (February 2011) (144,000)
New Powerflex Rear Trailing Arm Bushing (February 2011) (144,000)
New Powerflex "Race" Differential Bushing (February 2011) (144,000)
New CV Boots (February 2011) (144,000)
New Bosch O2 Sensor (February 2011) (144,000)
New Pinion Seal (February 2011) (144,000)
New OEM Front/Rear Brake Lines (February 2011) (144,000)
New Rear Swaybar Links (February 2011) (144,000)
New OEM Steering Rack (September 2010) (142,500)
New Front/Rear Shock Mounts
New Odometer Gears (December 2010)
New OEM Hella Interior Light (August 2010)
New Fuel Filter (July 2010)
New Control Arms (July 2010)
New Tie-Rod Assembly (July 2010)
New Polyurethane Control Arm Bushings (July 2010)
New Front Sway Bar Links (July 2010)
New Timing Chain Tensioner (March 2010)
New Oil Filler Cap (March 2010)
New 4-Pintle Bosch Fuel Injectors [Part #:0 280 155 710] (September 2010)
New OEM Bosch Spark Plugs (September 2010)
New HQ Autosport Coil On Plug Kit (September 2010)
New Zimmermann Front/Rear Cross-Drilled/Slotted Rotors (July 2010)
Fixed the "Mess Under The Intake" (September 2010)
Royal Purple Differential Fluid (July 2010)
Crack Free Dash (December 2010)
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