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Pelican Technical Article:

Oil and Filter Replacement

Ken Freund

Time:

1 hour1 hr

Tab:

$60

Talent:

*

Tools:

17mm wrench, 14mm hex drive or Allen wrench, drain pan

Applicable Models:

Mercedes-Benz 450SL (1973-80)

Parts Required:

9 quarts oil and filter kit with O-ring seal and metal washers

Hot Tip:

Get the engine warm before you drain the oil

Performance Gain:

Longer engine life

Complementary Modification:

Flush your cooling system, change brake fluid, check all fluid levels, inspect rubber boots, hoses

Clean oil of the correct type and viscosity is critical to long engine life. Obtain oil of the recommended viscosity and type for anticipated weather and operating conditions. Conventional and synthetic and synthetic blends can be used.

Follow factory service recommendations, listed in the owner's manual and maintenance schedules. Most collector cars are driven less frequently and cover fewer miles per year than daily drivers. If you don't drive your car too often, still change the oil at least once per year.

Ensure that you have everything on hand that is needed for this job. You will need an oil filter kit, a 14mm hex drive tool or Allen wrench, a 17mm wrench or a 17mm socket and ratchet, rags or paper towels, a large oil drain pan and 9 quarts of oil (actual capacity with filter change is about 8.5 quarts). Rubber or nitrile gloves are recommended to protect your hands. You'll also need a funnel and a container to carry the drained oil to a recycling center.

Run the engine until it reaches normal operating temperature, because running the engine puts sludge and tiny particles into suspension, so they will come out when the oil is emptied and warm oil drains faster.

Place the transmission in Park, engage the parking brake and chock the rear wheels. Jack the front of the car up and place it securely on jack stands. Refer to our article on safely jacking up and supporting a car.

Place cardboard or newspapers under the work area to make cleanup easier. Position the drain pan under the engine, where the oil will gush out when the plug is removed. Remove the oil drain plug (14mm internal hex) from the oil pan. Remove the old copper washer from the drain plug. The oil will be hot, so it's a good idea to wear rubber gloves and have plenty of rags or paper towels on hand to clean up any oil that may spill. Let the oil drain completely. Once fully drained, install the oil drain plug with a new copper washer and tighten it securely.

With the drain pan in place, remove the bolt (17mm hex head) securing the oil filter housing. Allow the oil to drain out and remove the filter element from the housing. Remove the bolt from the housing, noting the placement of the spring and washer in the bottom of the housing. Remove the O-ring from the sealing lip. Clean and set aside the spring/washer assembly, then clean the aluminum filter housing. Install a new steel washer on the bolt and then insert the bolt into the filter housing. Install the spring/washer assembly (with the washer side facing up toward the oil filter element). Insert the oil filter element into the housing, with the small center hole facing down into the housing. Install a new O-ring into the sealing lip groove.

Install the oil filter housing with a new filter into place, ensure that the housing is properly positioned and start the threads very carefully. It's easy to cross-thread the bolt and/or have the O-ring slip out of position. Take extra care in this critical part of the job. Tighten the bolt securely once it's threaded in properly.

Inside the engine compartment, remove the oil filler cap (twists off counter-clockwise) located on the right side valve cover. Add 8 quarts of new oil into the oil-filler hole and install the cap. Start the engine and check for oil pressure; it should take several seconds for the filter to fill up and oil pressure to reach normal (shut off engine if oil pressure doesn't come up within about 15 seconds). Shut the engine off and allow the oil to settle in the pan. Check for oil leaks. Lower the vehicle so it's sitting level. Check the dipstick and add oil as needed until it reaches the top mark on the dipstick. Install the oil filler cap back on the valve cover.

Pour the waste oil into a storage container. Always dispose of used motor oil and filters properly. Most oil-change shops or auto-parts stores, and some city recycling centers, will accept old oil and filters to be recycled.

Enter the date and mileage and what type oil was used into the maintenance records. It's also a good idea to install an oil change sticker in the door jamb.

The oil pan drain plug is located near the lower edge of the oil pan.
Figure 1

The oil pan drain plug is located near the lower edge of the oil pan.

Use a 14mm hex drive (special Mercedes tool shown) to remove the oil drain plug.
Figure 2

Use a 14mm hex drive (special Mercedes tool shown) to remove the oil drain plug.

Locate the oil filter housing adjacent to the oil pan.
Figure 3

Locate the oil filter housing adjacent to the oil pan.

Use a 17mm wrench to unscrew the oil filter housing bolt.
Figure 4

Use a 17mm wrench to unscrew the oil filter housing bolt.

A 17mm socket and ratchet with extension can also be used.
Figure 5

A 17mm socket and ratchet with extension can also be used.

Lower the filter housing and pour the oil out of it.
Figure 6

Lower the filter housing and pour the oil out of it. Then remove the filter element.

Use a small screwdriver or pocket knife to remove the old O-ring from the groove.
Figure 7

Use a small screwdriver or pocket knife to remove the old O-ring from the groove.

Slip the bolt out, clean it and install a new steel washer from the kit.
Figure 8

Slip the bolt out, clean it and install a new steel washer from the kit.

After reinstalling the bolt, slip the spring/washer assembly into place with the washer on the oil filter side.
Figure 9

After reinstalling the bolt, slip the spring/washer assembly into place with the washer on the oil filter side.

Slip the filter into the housing with the large hole on the engine side (up).
Figure 10

Slip the filter into the housing with the large hole on the engine side (up).

Position the new O-ring from the kit into place.
Figure 11

Position the new O-ring from the kit into place.

Wipe old oil from the oil filter mount on the engine, then install the filter and housing.
Figure 12

Wipe old oil from the oil filter mount on the engine, then install the filter and housing.

An oil change sticker helps keep track of when service is performed and needed.
Figure 13

An oil change sticker helps keep track of when service is performed and needed.

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