All 6-cylinder gas engines during this period have adjustable valve clearances that should be checked every 15,000 miles. Only one wrench is needed to adjust these valves. There are no locking nuts like on the diesel engines.
We recommend you change the valve cover every time you remove it. Not worth the chance for oil leaks. And install it dry to prevent weeping oil.
In this very detail 24-minute video, Kent will explain some of the challenges you might face adjusting the valves on your old six-cylinder. He will share with you some of the tricks and tips he has learned over the years, and demonstrate how to use his special tools to do the job properly.
All 6-cylinder gas engines during this period have adjustable valve clearances that should be checked every 15,000 miles. Only one wrench is needed to adjust these valves. There are no locking nuts like on the diesel engines.
You will get not only belt replacement instructions, but also instructions for changing the thermostat, the A/C idler pulley, and the fan clutch, as well as tips and tricks to do these jobs successfully without breaking anything or pulling your hair out.
If you have no idea when this pulley was last replaced, just plan to replace it when you do your V-belts. The bearings can get quite noisy long before it actually fails.
Location of the idler pulley.
Four new Continental belts with detailed video instructions. You should consider replacing the following at the same time, as they are commonly due to age and neglect.
This is one of the most often neglected services I see on the M272 engine. This tank ONLY FITS the ML350.
This part will fail due to age. It is simple to test with a fuel system pressure tester and easy to install on your fuel rail if you find it has failed.
New water pump as shown for your 380SL or 380SE/C. These are getting more expensive by the month!
In this 16-minute video, Kent explains the two upgrades he made in early 2026 to his electronic fuel injector tester. This video is specific to the tester we sell on this website. See related products below.
In this 20-minute instructional video, Kent will demonstrate how to use our repair kit to replace the intake manifold control flap vacuum hose without having to remove the manifold. You must have the right tools and fitting in order to do this, or you will be frustrated beyond belief.
This can be used on older 4, 6, and 8 cylinder gas engines up to around 2011 that have 5/8" spark plugs (except the M112 and M113 engines due to restriced access - see related products below). On some engines, you have very limited room to get to the rear sparkplugs.
Yes, that is correct, these are OEM parts - not cheap aftermarket. These are the same parts on all 272 V6 and 273 V8 from 2006 to 2013. That is a few million cars that are now all aging, and many have not had these parts replaced.
Here is a preventative maintenance issue that hardly ever gets mentioned. I think some people believe electronic fuel injectors will last forever. I took an ML320 with 250K and decided to replace the injectors.
Watch the YouTube video below where Kent installs this kit on a GL450. Kent will tell you everything about this kit and why you should do this joy yourself around 100,000 miles. All the procedures are the same for the W221 (non-ABC) and W211 with the V8 engines.
This is a must-do anytime you have the transmission out of one of these cars, and you know it has not been done in the past 10 years. Of course, if you are leaking engine oil out of the bellhousing after a long drive, then you should also replace it.
The kit contains the following"
In this 9-minute instructional video, Kent will give you an overview of what is required to change the plugs in your ML320 and share some tips to help you avoid frustration and potential mistakes.
Plugs are one of the most neglected things we see on these old ML320s. Probably because the engine seems to run so well even when they are badly worn like you will see here. This kit is designed for the DIY mechanic. Yes you can do it yourself and save big $$$.
More often than not you will find these cracked and broken.
Since these engines run so well, some believe that the fuel injectors will last forever. If you have noticed your fuel economy is declining or your engine oil seems thin, then replace these injectors.
Since these engines run so well, some believe that the fuel injectors will last forever. If you have noticed your fuel economy is declining or your engine oil seems thin, then replace these injectors. Best to do it after 150K as a preventative measure to increase engine life.
Only three sets are available. This is one of the better aftermarket wire sets we have seen. Some of the wire lengths may be slightly different from Mercedes' original, but they install just fine with no excessive looping.
Please note: These are not "complete instructions. Why are there no complete? Kent decided not to show all the details of removing and reinstalling the manifold, as there are at least half a dozen good videos on YouTube showing the entire process in detail.
PLEASE NOTE BEFORE ORDERING. SET OF 8 INJECTORS ONLY.
PLEASE NOTE: These are custom assembled in our shop after an order is placed. Please allow 4 to 5 business days before it can be shipped. Where is the problem, and why do they fail? Plastic is weak and can not tolerate excessive heat and stress.
PLEASE NOTE: These are custom assembled in our shop after an order is placed. Please allow 4 to 5 business days before it can be shipped. Where is the problem, and why do they fail? Plastic is weak and can not tolerate excessive heat and stress.
An often overlooked aged rubber part on these older v8 engines. No instructions included but can be found online.
Of course, you want to change this if you find oil leaking out the bottom onto your drive belt, but it can also leak internally, allowing coolant to get into your engine oil or vice versa. 272273
Genuine Meredes part. Replace this seal at 100K to prevent dirt from entering your engine. 272273
These 6-minute video instructions are now included with Kent's basic and deluxe Version 3 fuel injection pressure tester.
PLEASE do not order in error! Check your engine first with the cover off. It should look exactly like the one you see in the picture below. LH-Jetronic fuel injection is electronic, so it does not require a fuel accumulator at the car's back end.
Genuine Mercedes new part a shown, but does have some shelf wear. This has been sitting in a dark and dry garage for about 20 years. It was mounted on an engine out of the car but not run. But it was put together with the housing and then taken apart.
When removing the upper radiator hose for engine service, such as replacing the electronic thermostat or the seal on the back side of the oil cooler, you will have to remove the upper radiator hose.
Would you like to make your 560SL engine compartment look like new again. This part is one of the biggest offenders as they all turn this weird yellow color, making it appear old and fading.
Would you like to make your 107 engine compartment look like new again. This part is one of the biggest offenders as they all turn this weird yellow color, making it appear old and fading. Cap is not included.
Cleaning the throttle body on 1998 to 2013 V6 and V8 engines can yield amazing results with improved idle, power, acceleration, and fuel economy. To do it, you must remove the MAF and the intake elbow that attaches to the throttle body on the back of the intake manifold.
Why is this not regularly done? Why don't a lot of shops recommend it? The results can be dramatic with regard to engine smoothness, acceleration, and fuel economy. What about the reports it can damage the engine?
In this 5-minute demonstration video, Kent will show you how to replace the exhaust hangers on a 2010 W221 S550. This is an easy DIY job and should be done at your 100,000-mile inspection. 272273
In this 14-minute instructional video, Kent will show you all the components of the engine's air injection system, how to inspect and test them individually, and how they work in concert with each other. This is definitely something you would want to add to your own 100,000 inspection.
In this 10-minute video, Kent will explain the operation of these two valves on top of the front of the engine, how to test them, and how easy it is to replace them. If you are having problems with your electric air pump wearing out prematurely, the problem may be these valves. 272273
Why is this not regularly done? Why don't a lot of shops recommend it? The results can be dramatic with regard to engine smoothness, acceleration, and fuel economy. Watch the video below, and Kent will explain the kit contents in detail.
If you are doing a complete power steering flush you will need to have 2 liters on hand. It will take approximately 1.5 liters to flush all the old fluid out of the system. If you want to do this service on your Benz, please see related products below for our 40K service kit. 272273
In this extensive and highly detailed 32-minute video, Kent will walk you through the procedures of extracting power steering fluid out of your old tank and installing a new tank without spilling fluid all over your engine compartment.
You do the throttle body cleaning service, and you might be surprised at the results. When does this ever get done? I have experienced smoother idle, less stumbling, more power and better fuel economy from just doing this easy and inexpensive service. Plan to replace this seal every 80K miles
In this 21-minute instructional video, Kent will show you how to access the MAF sensor and correctly clean it with the proper spray cleaner. This cleaner can be picked up at any auto parts store but must be specific for mass air flow sensors.
In this 14-minute instructional video, Kent will show you how to access the MAF sensor and correctly clean it with the proper spray cleaner. This cleaner can be picked up at any auto parts store but must be specific for mass air flow sensors.
In this 11-minute instructional video, Kent will show you how to correctly remove the intake elbow ( with mass airflow sensor), install a new seal that connects to the intake manifold, and replace the entire assembly back on the engine.
You will get 2 Premium German oil filters for optimum performance with synthetic oil, including all seals, one all-aluminum deep filter wrench, and one aviation-grade lint-free cloth to clean out the oil filter housing.
When you download this from your "account" at Mercedessource.com you can print it on standard 8 1/2 x 11 paper, or you can view it from any computer if you are logged in at Mercedessource.