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Changing Your Oil and Filter
 
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Pelican Technical Article:

Changing Your Oil and Filter

Steve Vernon

Time:

1 hour1 hr

Tab:

$75

Talent:

*

Tools:

8mm, 13mm, 27mm socket

Applicable Models:

Mercedes-Benz C230 (2002-05)

Parts Required:

Oil and Filter

Hot Tip:

Get the engine warm before you drain the oil

Performance Gain:

Longer engine life

Complementary Modification:

Flush your cooling system and replace your radiator hoses

One of the most common tasks to perform is replacing your engine oil. Frequent oil changes are perhaps the most important procedure you can do to maintain and prolong the life of your engine. With the better oils that are available today, the requirement for frequent changes is diminishing. Even though Mercedes Benz recommends oil change intervals that are much further apart than in the past, I usually recommend that you keep the changes under the 5,000-mile limit. If you don't drive your car too often, you should change the oil at least once a year to keep things fresh.

The first thing you need to do is to make sure that you have everything that is required for the job. Nothing is more frustrating than emptying your oil, only to find out that you don't have a replacement filter or enough oil. You will need an oil filter kit, an 8 mm socket wrench, a 27mm socket for the oil filter housing, a new drain plug gasket, a roll of paper towels, a very large oil pan or bucket, and 6 liters of oil. Start by driving the car around, and let it heat up to operating temperature. You'll want to empty your oil when it's hot, because the heat makes the oil flow a lot easier, and more particles of metal and dirt will come out when the oil is emptied.

Next safely jack up and support your car. With the car safely off the ground you will need to remove the engine and transmission trays. You can get away with just removing the transmission tray but you will need to remove two of the six bolts holding the engine tray on, so I recommend removing both, that way you can have a look around and clean up any spills or debris under the engine tray while you are in there. There are six 8mm bolts holding the tray on, the rear two also help hold the transmission tray. Remove the engine tray and then the four remaining bolts holding the transmission tray on.

On the lower left side of the rear oil pan you will find the 13mm drain plug, use a wrench and remove it. Remember the oil is going to be hot coming out of the motor so make sure you don't burn yourself and try not to drop the drain plug in the container you are using to catch the oil. Always dispose used motor oil according to the regulations where you live. Most oil change shops or your neighborhood parts store will take your old oil and filter to be recycled properly. Once the oil has emptied reinstall the drain plug with a new crush washer. I always make sure I reinstall the drain plug before I start working on the top of the engine, just so I don't forget it later. Reinstall the engine and transmission trays.

Move to the engine compartment where you will find the oil filter housing as well as the oil filler cap. The oil filter is contained in the oil filter housing. It is located behind the air lifter box right by the firewall. The oil filler cap is located on the top of the engine cover.

Place your 27mm socket over the filter and loosen it. With the filter housing loose you can pull it straight up and out of the engine. Be careful as it will be covered in oil and has a tendency to drip.

Slide the old filter off and inspect it for any metal. There are three separate rubber o-rings or gaskets on the filter holder, thankfully they are all different sizes and will only fit in one spot. Use a little of your new clean oil to help get the new o-rings in place.

Reinstall the new filter and housing and torque to spec. Be careful not to over tighten. Open the filler cap and pour in 5 1/4 quarts of oil. The engine will take 5 3/4 quarts of oil but it is easier to add some more than take some oil out if you over filler it. Check your oil level according to your owners manual.

Begin by safely jacking up and support your car.
Figure 1

Begin by safely jacking up and support your car. With the car safely off the ground you will need to remove the engine tray. There are six 8mm bolts (red arrows) holding the tray on, the rear two also help hold the transmission tray.

Use an 8mm socket and remove the bolts (yellow arrow).
Figure 2

Use an 8mm socket and remove the bolts (yellow arrow).

Remove the remaining four bolts (red arrows).
Figure 3

Remove the remaining four bolts (red arrows). If you have not removed the engine tray you will need to remove the two bolts that hold both the engine and transmission tray on (yellow arrows).

There is an oxygen sensor (red arrow) holder attached to the oil pan right above the drain plug, it is best to move it out of the way first.
Figure 4

There is an oxygen sensor (red arrow) holder attached to the oil pan right above the drain plug, it is best to move it out of the way first. On the left rear of the oil pan you will find the 13mm drain plug (yellow arrow), use a wrench and remove it. Remember the oil is going to be hot coming out of the motor so make sure you don't burn yourself and try not to drop the drain plug in the container you are using to catch the oil. Always dispose used motor oil according to the regulations where you live. Most oil change shops or your neighborhood parts store will take your old oil and filter to be recycled properly. Once the oil has emptied reinstall the drain plug with a new crush washer (yellow arrow). I always like to make sure I reinstall the drain plug before I start working on the top of the engine, just so I don't forget it later. Reinstall the engine tray.

Move to the engine compartment where you will find the oil filter housing as well as the oil filler cap.
Figure 5

Move to the engine compartment where you will find the oil filter housing as well as the oil filler cap. The oil filter is contained in the oil filter housing (red arrow). It is located behind the air lifter box right by the firewall. The oil filler cap (yellow arrow) is located on the top of the engine cover.

Place your 27mm socket over the filter housing (red arrow) and loosen it.
Figure 6

Place your 27mm socket over the filter housing (red arrow) and loosen it. With the filter housing loose you can pull it straight up and out of the engine. Be careful as it will be covered in oil and has a tendency to drip.

Slide the old filter (red arrow) off and inspect it for any metal.
Figure 7

Slide the old filter (red arrow) off and inspect it for any metal. There are three separate rubber o-rings or gaskets on the filter holder, thankfully they are all different sizes and will only fit in one spot Yellow arrows). Use a little of your new clean oil to help get the new o-rings in place. Slide the new filter on (red arrow).

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