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Pelican Technical Article:

Engine Oil and Filter Change

Kerry Jonsson

Time:

1 hour1 hr

Tab:

$25

Talent:

*

Tools:

13mm, 17mm socket with ratchet and extensions, small pick

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Drain plug, oil filter cover

Hot Tip:

Remove the oil filter first to allow it to drain into the oil pan

Performance Gain:

Extend engine life

Complementary Modification:

Check all fluid levels

You've probably heard it before and yes, oil is the life blood of your engine. Oil has long polymer chains that fill the gap between your piston rings and bearing surfaces to protect between metal on metal contact. Oil can undergo thermal breakdown from engine heat and mechanical breakdown while protecting vital engine parts.

There are three types of oil you can put in your engine. One is mineral based oil (conventional) oil and should be changed every 2500 to 3000 miles. You can also get a semi-synthetic blend that you can leave in your engine slightly longer. Finally you can put in a full synthetic oil that I change every 5000 to 7500 miles but manufactures tell you that you can leave this oil in for 10,000 to 15,000 miles. All engines burn some motor oil during normal use so the level should be checked as the mileage interval goes up. Oil viscosity is also important. Multi weight oils have two ratings. The first number is the viscosity or thickness of the oil at room temperature. The second number is the oils viscosity or thickness at a higher temperature. The higher the number the thicker the viscosity, so when you see 10W-40 the oil flows like a 10 weight motor oil when it is cold and a 40 weight motor oil when it is hot. 5W-30 would be a thinner motor oil which is good for colder climates and can get the motor oil circulating faster on cold days. 20W-50 is a thicker motor oil and will take longer to flow through the engine on a cold start but is betting as withstanding the higher temperatures on hot summer days while your engine runs at 180° to over 200° Fahrenheit. Most of us drive in what manufacturers consider is "severe service" which involves stop and go driving and excessive idling. This reduces the life of the engine oil so it should be changed more frequently. As the oil circulates it passes through a filter. Mercedes Benz uses a cartridge type filter that fits in a housing on the 119 V8 engine. This needs to get replaced every time you change the engine oil. In this tech article we will go over the steps to properly change your engine oil and filter.

Conventional (mineral-based) oil 2500 to 3000 miles, semi-synthetic approximately 4000 miles and full synthetic 5000 to 7500 miles (up 10,000 to 15,000 at your peril)

In order to change your engine oil you will need to jack up and support the front axle of the car. See our tech article on jacking up and supporting your vehicle.

PLEASE NOTE: This article does NOT apply to the 16 valve 1999 SL500.

We recommend you start at the oil filter housing.
Figure 1

We recommend you start at the oil filter housing. Working on the right side of the engine in front of the exhaust manifold you will see the oil filter housing cap. Remove the 13 mm oil housing cap fastener.

Pull the fastener all the way out of the housing.
Figure 2

Pull the fastener all the way out of the housing.

Pull the oil filter housing cover off of the housing.
Figure 3

Pull the oil filter housing cover off of the housing.

There is a metal loop on the oil filter.
Figure 4

There is a metal loop on the oil filter. Use the metal loop to pull the oil filter out of the oil filter housing.

This allows the oil in the filter housing to drain into the oil pan.
Figure 5

This allows the oil in the filter housing to drain into the oil pan. You can also fill the oil from here if you have a long enough funnel.

Remove the 13 mm oil drain plug and allow the oil to drain.
Figure 6

Remove the 13 mm oil drain plug and allow the oil to drain.

Use a pick to remove the Â
Figure 7

Use a pick to remove the Â"OÂ"-ring on the oil filter housing and replace it with a new one. Installation is the reverse of the removal steps. Fit a new crush washer on the oil drain plug and install the drain plug in the drain pan being careful not to over-tighten or strip it. Install a new oil filter with a metal loop facing upward. Fit the oil filter housing cap and the long bolt used to fasten it. Tighten down the oil filter housing cover. Fill your engine with the proper amount of oil. Check fuel oil level with that the dipstick tube after you take the car off of the jack stands. Start your engine and let it run for 5 minutes then shut off the car and let it sit for 5 minutes. Recheck your oil level.

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Comments and Suggestions:
fayez Al-Shammari Comments: What type of oil used for the two Mercedes 500 model in 1992 and the high temperature we have in Saudi Arabia exceeds 45 ° C
July 30, 2016
  Followup from the Pelican Staff: I am not familiar with your region requirements. Check with a local MB shop. - Nick at Pelican Parts  
Bob Comments: What oil is recommended for my 1998 SL500 with 40,000 miles? I have recently purchased this vehicle with very few service records.
July 16, 2016
  Followup from the Pelican Staff: See this page:

http://www.pelicanparts.com/cgi-bin/supertech/catalog.cgi?action=frameset&return-url=/cgi-bin/supertech/catalog.cgi%3Faction%3Dframeback%26page%3D1504&catalog-url=http%3A%2F%2Fwww.pelicanparts.com%2Fcatalog%2FSuperCat%2F4052%2FMBZ_4052_BASFLT_pg2.htm %3Futm_source%3DSuperTech%23item9 - Nick at Pelican Parts
 
Bob Comments: How do you reset the oil change indicator on the dash? It gives the indication in number of days.
June 24, 2016
  Followup from the Pelican Staff: What vehicle? - Nick at Pelican Parts  
BHBarr Comments: Comnpletly different on the 16 valve motor in the 1999 SL500.
June 4, 2016
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it. I will have the article vehicle application data updated.
- Nick at Pelican Parts
 

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