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2003 S500 (255,000 miles), 2015 ML350 4matic (66,000), 2009 S550 4matic (110,000)
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24 Posts
Discussion Starter #1 (Edited)
Recently purchased and going through all systems ... changing fluids, filters, updates, etc. I have seen some information about someone attempting to change the front differential gear oil, but it was iffy at best. It appears to be done by removing one of the CV shafts for refill after draining from drain plug. I haven't looked yet, but is it possible to add gear oil through the breather port if it is even accessible? Maybe install a drain port to drain and fill ... quick connect? Anyone tried this yet?
 

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Registered
2003 S500 (255,000 miles), 2015 ML350 4matic (66,000), 2009 S550 4matic (110,000)
Joined
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24 Posts
Discussion Starter #3
Thanks for the link ... it does sound a little messy and slow. I was thinking of installing a quick connect valve and using a pump to fill with the required amount ... similar to the pump used for transmission service. We used quick connect valves for engine oil draining and refilling when I was servicing Straddle Carriers with Mercedes diesel engines. I'll post back any information on which direction I decide to go ...
 

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2003 S500 (255,000 miles), 2015 ML350 4matic (66,000), 2009 S550 4matic (110,000)
Joined
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24 Posts
Discussion Starter #4
Well, I finally got around to changing the front differential fluid and it was really quite simple. Thanks to konigstiger for the link. Since I had recently serviced the rear differential, I just used the hand pump I purchased from FCPEuro. I Removed the drain plug and found that the fluid had been changed some time in the past. It was alot cleaner than the rear diff fluid. It was approximately 660ml. Using one leftover 1 liter bottle of Liqui-Moly hypoid gear oil, I drained 200ml from the bottle. Since the pump tube doesn't reach the bottom of the bottle, I guessed that removing 200ml would get me close to the amount that is needed for the fill.
I have a box of o-rings of various sizes and found two small ones that I put over the end of the fill tube and taped them securely with electrical tape. I then placed the right size AC o-ring on top of the others leaving about 1 inch of tube exposed. Then it was just hold the end inside the drain port and letting the o-ring seal the hole until I had pumped enough fluid into the differential. When I had air coming out, I stopped and pulled the tube out while quickly inserting the drain plug. Only lost a drip in the transfer. I then measured the amount of fluid left in the bottle and it was approximately 150ml. That means that I had tranfered 650ml into the differential. Job done.
That was the last of the fluid changes that I needed to perform to get this vehicle up to date. I was able to obtain the Vehicle Master Inquiry from my local dealer at no charge and it let me know exactly what I needed to do to bring it up to date.
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