I am starting some maintenance catch up on my 1980 240d Manual trans.. and found this list of Tech Service Bulletins put out by Mercedes.... amazing... and will sure affect what I do to it... and may account for some people's problems which I have read about.... and which the factory manual did not address... these have the advantage of hindsight of course...
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Title S-Si-00-01-70 OCT 99 Vehicle - Roadside Assistance Program
P-99_00-222 MAY 99 Vehicle - Classic Car Service Manual, CD ROM
S-SI-58_99 AUG 98 Fuel - Fuel Drain Hoses & Portable Fuel Tanker
S-SI-40_26A AUG 98 Wheel - Balancer Adapters & Flange Plate
S-SI-58_82A AUG 98 Wheel - Balancer Adapters and Flange Plate
S-SI-14_12A MAY 98 I/M Emission Testing on Dynamometer
58_95 JUL 97 Engine - Oil Evacuation Equipment
00_65 JUL 97 Tools - Oil Evacuation Equipment
58_46C MAY 97 Policy - Special Tools Repairs
DDAF91_18-U-200APR 97 Dye transfer From Seat Leather to Clothing
41_017 MAY 95 Drive/Propeller Shaft - Alignment/Tool Set
46_057 MAY 95 Steering Gear - Inspection After An Accident
41_018 APR 95 Drivetrain - Troubleshooting Noise and Vibration
98_048 MAR 95 Engine - Caution Prior to Degreasing
ATRATB273 JAN 95 A/T - No or Late Shifts
ATRATB272 JAN 95 A/T - Rear Seal Blowout
ATRATB293 JAN 95 A/T - Slips on Shifts/No Kickdown
42_127 NOV 94 Brake Discs - Coating Removed During Thorough Test Drive
ADM402 SEP 94 Cruise Control - Inop After Installing Amplifier
83_081A AUG 94 A/C - R12 to R134a Conversion
ADM322 JUL 94 Cooling - High Coolant Temperatures
ATRATB260 JAN 94 A/T - Bind In Reverse/Delayed Forward Engagement
ATRATB232 JAN 94 A/T - Sliping Forward, Flares, Binds Into High
ATRATB218 JAN 94 A/T - Valve Body Identification
27_095 DEC 93 A/T - Modifications and Innovations
58_043A NOV 93 Policy - A and B Tools, Inventory List
58_070 NOV 93 Suspension - Measuring Ride Height, Modification
27_094 OCT 93 A/T - Standardized Design Control Pressure Cable
58_068 OCT 93 Policy - HHT Warranty & Precautions
40_127 OCT 93 Wheels - 15 Inch Steel, New Covers
58_069 SEP 93 Hand-Held Tester (HHT) - Updated Modules
99_154 SEP 93 Tools - Hand-Held Tester, New Modules
14_010 AUG 93 EGR - Vacuum Transducer, One Vent Line
54_071 AUG 93 Scan Tool (Impulse Counter ) - Failure, Improper Hook-Up
83_049 FEB 93 A/C - Bear R12/R134a Leak Detector Modified
58_060 FEB 93 A/C - Updated Leak Detector for R12 and R134a
00_050 FEB 93 Policy - Vehicle Emission System Tampering
54_050 OCT 92 Battery - Jump Starting and Charging Procedures
41_001C JUL 92 Flex Disc - (Torsion Style) on Front Driveshaft Improved
00_049 JUL 92 PDI - Review of Recall/Campaign Prior to Delivery
82_062 JUN 92 Horn (Fanfare) - Repair by Turning Adjustment Screw
01_022B MAY 92 Engine - Revised Specs Cylinder Head Bolts/Piston
ATRATB108B APR 92 A/T - Identification
ATRATB109B APR 92 A/T - Modulator Application & Pressure Specifications
40_019 FEB 92 Wheel - Adhesive Balance Weights Removal Tool
58_050 FEB 92 Wheels - Removal of Adhesive Wheel Balance Weights
ATRATB078 NOV 91 A/T - How To Use A Pressure Gauge
00_046 NOV 91 Warranty Claims - Including Diagnostic Fault Codes
46_075 OCT 91 Power Steering Fluid Level Indicator - Modified
15_048 SEP 91 Policy - Unnecessary Replacement of Alternators
01_006 AUG 91 Engine - Caution When Installing Head Bolts
83_037 JUL 91 A/C - Warning Against Refrigerant Alaskankool R176
ATRATB041 MAY 91 A/T - Modulator Identification
01_021A APR 91 Engine - Oil Capacity Changed
00_086A APR 91 Engine - Oil Capacity Reduced
40_018 APR 91 Wheels - Don't Crome Plate Light Alloys
27_089 MAR 91 A/T - Circumstances for Modulating Pressure Test
40_017 JAN 91 Tires - Approved Summer/Winter Tires + Snow Chains
40_016 DEC 90 Tire - Aerosol Inflator/Sealer Flammability Hazard
58_046 NOV 90 Policy - Repair Information
40_099 NOV 90 Tires - Damage Caused By Pressure Washer
ATRATB028 OCT 90 A/T - Engine Vacuum Testing
42_007 OCT 90 Brakes - General System Precautions
05_004 OCT 90 Valve Guides - Special Tools for Checking & Replacement
00_041A OCT 90 Warranty - Return of Fuel System Components
00_081 JUN 90 Engine - Break-In Oil New and Rebuilt
18_010 JUN 90 Engine - Oil Filter Precaution For Gasket/O-Ring
14_004 MAY 90 Emissions - Catalytic Converter EPA Replacement Warning
00_039 MAY 90 Engine - Warning About Carbon Cleaning
67_002 MAY 90 Glass - Repair Recommendation
46_067 MAY 90 Power Steering Pump - Leak Checking
15_042 MAR 90 Policy - Ignition Wire Parts
58_076 MAR 90 Suspension - Spring Compressors
32_035 MAR 90 Suspension - Tool, 3-Lug Spring Compressor
58_044 MAR 90 Tools - Listing Update and Illustrations
ATRATB9002006 FEB 90 A/T - Choosing the Right ATF
ATRATB8930 OCT 89 A/T - Math Part II
ATRATB8927 SEP 89 A/T - Twenty Steps To Successful Repairs
ATRATB8923 AUG 89 A/T - Math Formulas Part I
40_010 MAR 89 Tires - Approved Summer Replacements
40_009 MAR 89 Tires - Approved for Summer and Winter Replacements
54_023 DEC 88 Electronic Components - Warning Against Repair
91_016 DEC 88 Seat Belt - Periodic Inspection
00_031A AUG 88 Oils & Fluids - Factory Approved Products
40_008 MAR 88 Tires - Traction Device `Spikes-Spider' is Not Approved
58_034 FEB 88 Lighting - Equipment For Headlamp Aiming
82_042 NOV 87 Alarm - Tester to Determine the Cause of False Actuation
91_011 NOV 87 Seat Belts - Precautions for Retractrors
83_025 OCT 87 A/C - System Information/Charts
82_023B OCT 87 Windshield Washer Solution - Mixing
ATRATB8754 SEP 87 A/T - Front Bushing Wear
ATRATB8748 AUG 87 A/T - Slipping or No-Shift/Metal Sealing Rings
40_063A MAY 87 Wheel Fastener - New Socket for Wheel Bolts
82_025 APR 87 Locks - Troubleshooting Before Replacement
32_029 MAR 87 Suspension - Tips for Universal Spring Compressor
91_004B JAN 87 Seat - Tether Strap to Secure Child Restraints
05_061 NOV 86 Special Tools Test Devices - Updated Listing
27_074 OCT 86 A/T - (722.4) Updated Lower Cover & Intermediate Plate
97_015 SEP 86 Body - Applying PVC Undercoating and Seam Sealer
20_034 DEC 85 Radiator Cap - Update My Prevent Coolant Loss
46_061 NOV 85 Power Steering - New Fluid Availability
35_001A JUN 85 35_001A - 06/01/85
07.1_013 MAY 85 Injection Pump - High-Pressure Timing
07.1_033 MAY 85 Injection Pump - Updated Checking Procedure
20_004AZ JAN 85 20_004AZ - 01/01/85 Updates 20_004Z 1984/11/01
26_016 JAN 85 M/T - Leaks at Rear Cover
29_001 DEC 84 Clutch Master Cylinder - Updated Adjustment
20_004Z NOV 84 Engine Block Heater - Update & Installation Instructions
05_054 NOV 84 Timing Chain - Modified Connecting Link
00_022 AUG 84 Engine - Break-In Oil for Use After Major Repairs
99_040 MAY 84 Policy - Sketch For Damage to Paintwork
58_032 MAY 84 Special Tools - Vacuum/Pressure Tester
97_012 APR 84 Body - Mercedes Body Seam Sealer Precaution
40_004 APR 84 Wheel Alignment and Chassis - Measurement Worksheet
42_083 MAR 84 Brake Pad - Replacement Tools
18_026 FEB 84 Oil Cooler - Repair
20_026 JAN 84 Radiator Cap - Modified Design
09_003 DEC 83 Turbocharger - Troubleshooting Hints
42_002 NOV 83 Brakes - Fluid, Pads, Calipers - Notes and Cautions
83_037 SEP 83 A/C - ACC Servo Unit Testing
83_036B SEP 83 A/C - Modifications to Climate Control System
15_001 SEP 83 Charging System - Basic Test Reminders
18_001 SEP 83 Engine - Oil Level Should Be Checked
27_006 JUL 83 A/T - Vacuum Control Valve Updated
58_014 JUN 83 Body and Frame - Fender and Seat Covers
26_012 MAR 83 M/T - Modified Countershaft Rear Bearing & Journal
82_010 MAR 83 Radio - (Becker Grand Prix) Face Plate, Replacement
72_025A MAR 83 Window Frame - Reveal Moulding Replacement
72_033 MAR 83 Windows - Modified Crank Cover
83_038 FEB 83 A/C - Center Housing Replacement, ACC Servo Assembly
07.1_027A FEB 83 Fuel Injection Nozzles - Updated
continued....

20_020 FEB 83 Radiator Filler Neck - Coolant Leak Complaint
54_005 JAN 83 Cruise Control - Intermittent Operation
00_007 NOV 82 Diesel Engine - Cold Weather Operation
58_006 NOV 82 Frame - Electric Hoist Adapters
58_005 NOV 82 Fuel - EFI Analyzer Test Sheet
58_008 NOV 82 Policy - Tool Identification Label Sets
58_003 NOV 82 Service Information Bulletins - Availability
58_010 NOV 82 Warranty - Special Tools
DD07.1-82101 OCT 82 Difficult Starting at Operating Temperature
47_001 OCT 82 Fuel System - In Line Fuel Heater
DD07.1-82102 OCT 82 Poor Engine Performance, Excessive Smoke
05_047 JUL 82 Timing Chain - Required Tool
02_002 JUN 82 Body - Modified Front Fender Splash Panel
15_019 APR 82 Alternator - Introduction 55 Amp Motorola
DD01-82042 APR 82 External Oil Leaks
72_028 APR 82 Front Door Handles and Locks - Modified
67_009 APR 82 Rear Window Sealing Frame - Modified
77_009 APR 82 Sunroof - Leak Repair Procedure
40_043 APR 82 Wheels - Light Alloy Rims With Short Rubber Valves
58_007 FEB 82 A/C - Expansion Valve Replacement Special Tool
07.1_006 FEB 82 Policy - Warranty Requirements
MEMO MAR 80 Policy - Federal & State Safety & Emissions Regulations

You can check your particular car by going to alldata.com
on 1981 and older they give you this type list and say to check with the manufacturer....
Have any of yall gone to the dealer to read or get copies of these tsb's, or found them other places ?

Things like ' M/T - Modified Countershaft Rear "
"M/T - Leaks at Rear Cover "
worry me...