Plastic hose also works when filling a manual trans. It helps to know the capacity. Then you can just poor in the required amount & be done.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

lol, I didn't have a 14mm socked, I used a 14mm bolt and 2 nuts. used a vice to hold the bolt while I threaded the nuts into eachother. I thought I was going to break the bolt but the nuts jammed up, and I was able to slip a socket over the nuts and use a braker bar to get it out. Pretty redneck, but It was 9pm and I wanted to get the job done that night.

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Clever.

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84 300D 255K "Mr B" ("Mr Becker")
79 300D 265K "Mrs B"
85 300TD 175K "Mali" (Sold)
74 Ford F-100 74K "Bonnie" (Sold)
67 Jeepster Commando (Sold)

75-90 synthetic is recommended in one of the MB technical service bulletins.
It does seem to quiet the differential = make it happier.



Have a great day.

__________________
ASE Master Mechanic
asemastermechanic@juno.com

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Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
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Technical Quality Auditor.
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1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

How long does this stuff last? Just wondering if I really even need to change the fluid. I dont know that it's ever been done, but I thought it might be good preventative maint. Any suggestions?

The diff cover is aluminum and the plug is steel (at least that's what they felt like) so I'd imagine there's also galvanic corrosion going on.

IMHO, just pull the whole cover off and put it in a vise rather than bothering with it under the vehicle. Drains faster and its easier to apply the force necessary to break the top plug free...

Changing diff fluid isn't something you're likely to do more than once a year and you may as well take a peek at the R/P and spiders while you're there, plus cover off allows you to actually clean the inside of the case to rid it of little particulates and metal bits.

Yeah, its an extra couple of bolts and a tube of RTV but I think you can be more effective for that modest outlay of effort and materials.

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'84 300D
'97 Jeep XJ lots of mods
'01 Subaru Forester

If you use 75-90 synthetic = every 100K miles..

Thanks for the tip about the synthetic. the last time I used dino oil (about a year ago), and I can hear the diff. I'll be swapping it out for synthetic in a week or so! (once I get the parts to fix my dryer and get it out of the garage... arg.)

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I did this also, but I welded the nuts to a grade-8 bolt. It promptly twisted off after applying torque.

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1972 W115 220D/8 SLS, Coffman Starter "Ümläüt"

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Before or after you baked the cake?

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AJ

1985 300D (SOLD)