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#1
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Change Differential Fluid Highly Recommended
I just finished changing the differential fluid on a 1989 420 SEL with 218,000 KM (135,000 miles). The old fluid was dark olive green grey colour and it smelled aweful. I highly recommend changing the rear differential oil especially on the older W126 cars. I used a synthetic 75w90, about 1.45 litres.
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1989 420 SEL |
#2
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When I owned BMW's, they recommended changing every 30,000 miles. MB only recommends checking the level on my 300E every 30K.
I replace it every 30K using Mobil 1 75W-90. In fact, I also use Mobil 1 ATF fluid and motor oil. |
#3
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Differential oil, even synthetic, always seems to be quite stinky.
I wonder if sticking a king-hell powerful magnet to the outside of the differential, and the engine and tranny oil pans would be useful at keeping metal filings out of the gears?
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Semibodacious Transmogrifications a Specialty 1990 300D 2.5 Turbo sedan 171K (Rudolf) 1985 300D Turbo TD Wagon 219K (Remuda) "Time flies like and arrow, yet fruit flies like a banana" ---Marx (Groucho) |
#4
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Differential fluid has plenty of sulfur in it, and you know that most compounds of sulfur with other substances are very smelly or stink.
Eric |
#5
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Gear oil...
All gear oil has a certain smell that gives me a headache.
It's the one smell from an automobile that I really hate. |
#6
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Re: Gear oil...
Quote:
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John Shellenberg 1998 C230 "Black Betty" 240K http://img31.exs.cx/img31/4050/tophat6.gif |
#7
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diff lube change
The mechanic @ the MB shop wondered why I would "even bother @ ONLY 120K miles..."
I gave him a couple quarts of 100% synthetic 75W-90, he put in a quart and a half, my wife's commuter mileage went up almost a full 1 mpg with no other changes. He bought another quart and changed the diff lube in his 560SEC and saw an almost identical rise in his mpg. He now believes...
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'91 420 SEL @ 199K, '92 SVX @ 181K, '93 SC400 @ 86K, '93 Kaw ZX-11 @ 30K, '87 F250 @ 181K , 2001 Valkyrie Interstate @ 6K, Y2K Honda NightHawk 250 with 1.5K, '88 420SEL I.@ 179K & the 2nd latest, an '88 420SEL II.@ 210K runnin' parts car, '85 F150 300/NP435 |
#8
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Some where on this site someone posted pictures of inside their differential after running synthetic lube. It was remarkable how clean it was. No yellowing etc.
I recently changed the valve cover gasket on the 300E. This car has 215k miles and all the rockers etc are incredibly clean and fresh looking. Haasman
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'03 E320 Wagon-Sold '95 E320 Wagon-Went to Ex '93 190E 2.6-Wrecked '91 300E-Went to Ex '65 911 Coupe (#302580) |
#9
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STORMINNORMAN
Did you use the scented or un-scented version ?
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2007 C 230 Sport. |
#10
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Synthetic Gear Oil
It makes sense to change the tranny fluid and Gear oil to synthetic, since they will last a lot longer than motor oil, and will not decompose due to the excessive heat of the engine.
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Semibodacious Transmogrifications a Specialty 1990 300D 2.5 Turbo sedan 171K (Rudolf) 1985 300D Turbo TD Wagon 219K (Remuda) "Time flies like and arrow, yet fruit flies like a banana" ---Marx (Groucho) |
#11
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Recommended Synthetic ATF
So what is the recommended synthetic atf for 1989 420 SEL?
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1989 420 SEL |
#12
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75W-90 Mobil 1, Valvoline, Redline or any name brand synthetic.
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#13
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Yep, that gear oil is vile stuff. Once it's on your clothes, the smell just will not come out.
Why does it have to smell so bad? Other oils are not nearly as repulsive.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#14
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Bud,
I believe he asked for ATF ... not diff oil-
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'03 E320 Wagon-Sold '95 E320 Wagon-Went to Ex '93 190E 2.6-Wrecked '91 300E-Went to Ex '65 911 Coupe (#302580) |
#15
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haasman, right you are!
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