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Door hinge lubrication has to be one of the most neglected maintenance items on the older models. I think part of the problem stems from the fact owners don't know how to do it or don't know how to acquire the proper grease gun to lubricate those special fittings on the door hinges.

These instructions cover problems you may have with your bulb holders, how to set up the new LED bulbs to do TIGHTLY into the bulbs holders so they won't come loose and go out on you, and how to modify and experiment with the maximum brightness of an individual LED bulb.

Wouldn’t it be grand if there was a way to remove your ignition tumbler without a key - then easily start the car using a flat blade screw driver or needle nose pliers and drive away?

How can you tell if you have a hole or leak in your exhaust system? What are the symptoms? Can the leak be patched? When will you have to get either a new center muffler or rear muffler or pipes or all three? Can you replace the mufflers yourself and what are the tricks?

If you have acquired one of these rugged W123 sedans, coupes, or station wagons and want to learn how to do some of the work on it on your own then here is a good place to start. Learn how to change lights and bulbs. No need to go to a mechanic for this.

Kent starts out the video talking about prevention by using the neck reinforcement kit he has been selling for years. In the case of his own 1990 300SL the neck had not been reinforced and it broke cleanly right in the middle.

In this video manual Kent will walk you step-by-step through the process of properly putting the caliper back together again with the new seals and correct assembly paste.

You can save a lot of money if you can rebuild your old brake calipers, especially on some older models. If you can just get the pistons out of the housings, most calipers are rebuildable, unless they have been subject to road salt or have sat exposed to the weather for years without use.

If your fuel level gauge is not reading accurately or the needle jumps around and or your car’s low fuel warning light does not comes on, it is usually a problem with the tubular sending unit in the fuel tank.

Transmission service on these older Mercedes is very often neglected and it is something you can do yourself. It should be done every 30,000 miles or every 5 years (whichever comes first). After you watch this video you will find out why you should do it yourself!

This carpet wetness is such a common problem on the W123 chassis that Kent decided to shot a short video explaining how to troubleshoot where the leak is coming from. He will point out the three potential areas for leaks and show how to use water to find the source.

If you think CIS fuel injectors can just be ignored, think again. Sure, your gas engine will continue to start and run “ok”, but you may find that it is not producing the power it once did nor the fuel mileage it once delivered.

In part 1 Kent covered the key components, where they are located and what they do. If you are not familiar with this system we recommend you watch part 1 first.

When replacing the steering lock assembly in your Benz you will need to remove that little black plastic switch on the side of the lock from the old one and put it on the new part. You can not pry it off, squeeze it off or pull it off by hand. 

If both dash lights are not working including the lights in the upper center console the problem is most likely in the dimmer switch located on the back of the instrument cluster. This is also called the potentiometer providing variable resistance in the wiring to the bulbs.

The timing device installed in the W115, W116, W123 and early W126 with OM615, OM616, and OM617 engines from 1986 to 1985 is somewhat a mystery to many owners.

Pencil (parallel style) glow plugs usually fail slowly over time. The first signs are rough running after startup. Then you may see a flashing glow plug light on your dash. If ignored over time you engine may not start at all.

If your rear door power window is not moving or the motor is not making any noise, it could be a failed motor, rear door switch, front switch or even a wiring problem. Trying to narrow down the problem can be frustrating unless you know the proper troubleshooting sequence.

The bowden cable runs from the transmission to the throttle linkage on many Mercedes from the early 1980's up through the early mid 1990's. When this cable fails or is out of adjustment the transmission will either shift too early or too late.

Is your driver side or right side manual adjusting mirror getting difficult to adjust? Is the mechanism broken or will not hold adjustment? Does the mirror glass need replacing? Repairing these types of problems is definitely something you can do yourself!