What you need to accomplish this: Drain pan: amzn.to/3dxlP5v Metric Hex Sockets: amzn.to/2FzlRx0 14mm Hex: amzn.to/2Tf6Q73 Gear oil pump: amzn.to/3j04PWE 1.1qts of gear oil: amzn.to/3j9JJoG Black plush cat (Less sharp than george): amzn.to/37dx6Xn (Links may be affiliate links, I will get a small commission if you choose to purchase from them, and it won't cost you a penny extra!)
Changed the rear diff fluid on my 83 240d manual and the road noise difference from the rear end was amazing. The fluid was changed 6 or 7 years ago and it was time for another fluid change. I refilled the diff with 75w-90 Mobil 1 synthetic and the difference was definitely worthwhile.
Mercedes in w115 w123 w114 w110 w108 w116 etc. Recommends only SAE 90 for the differential.. Using sunyhetic 75W90 for exampe, May cause problem (wear) to tha metal parts... These cars are old and need plain type of oil..
@@ΣωτηρηςΜανno reason to not use synthetic. Cars are old but some things have evolved GREATLY. Oil quality is one of them. Synthetic is simply far superior quality
@@MMWA-DAVE oh I figure its a wonderful joy, and grows exponentially as well, because "while I'm in there" I might as well do wheel bearings and brakes and shocks and I should put on the camber kit so I can correct the rear alignment with the heavy duty springs, and the heavier swaybar for better handling and so on and so on lol
You have a lot of great videos I have come across. I too am a diesel 123 owner just trying to keep it going for many more years of service. Did you ever get around to those CV boots?
...no. Thanks for the reminder haha, I have the new boots, tool and everything, I keep getting into other projects on my car and those boots are back there the same as they were. I need to do that soon before I forget again!
@@trythistv I believe I saw a video once about boot replacement and it stated that they are filled with oil? I could be wrong but the boot itself is designed to contain/hold a set amount of oil held in by the clamps. Either way I would be interested in seeing that video when you do it. I am fixing an issue on my 82 300D with the B2 piston in the trans as well as a significant leak on the turbo drain tube.
I'm not sure how I missed the comments on this video, evidently I haven't been getting notified of all of them. Anyway, flushing wouldn't hurt, my thought process is fresh oil, and I'll change it again after some driving, the first change will get the bulk of the contaminants, the rest will come on the 2nd change.
Another great, helpful video. I have a 1979 240D. I imagine they're very similar. What type of oil is it you used again? And what is the approximate capacity? And what about changing the manual transmission fluid? I looked at mine and it looks very similar to the differential where it has two bolts 1/4 fill. What type of oil is to be used in the manual transmission 240D? 1/4 drain.
I used 80w90 GL-5 gear oil, any reasonable weight near that will work perfectly, just don't use 140 weight or something. 75-90 is an excellent option as well. Takes just a hair over a quart, buy 2 quarts to be safe though. I used conventional oil, synthetic may be better, I will likely flush this oil out again after we've driven for a while since it was so nasty. The 4 speed manual transmissions I've been told to use a much lighter oil or it'll be weird to shift and can wear stuff out fast if used in cold environment where those gears are spinning around fast in oil that doesn't want to flow. Also, yes the drain/fill works the exact same way on the manual transmission, get the fill plug out, then pull the drain plug Some have said atf, I have read that the service manual for the 82 240ds said 10w20 engine oil in the transmission, so I used mobil 1 10w20 when I swapped the 4 speed into my grey 300d, it shifts great and seems happy with that.
I was surprised that mine wasn't worse, it was nasty and smelled horrible, but it was still mostly oil-ish. I'm going to change it again after a while and see if the fresh oil flushes out any nasty gunk
What you need to accomplish this:
Drain pan: amzn.to/3dxlP5v
Metric Hex Sockets: amzn.to/2FzlRx0
14mm Hex: amzn.to/2Tf6Q73
Gear oil pump: amzn.to/3j04PWE
1.1qts of gear oil: amzn.to/3j9JJoG
Black plush cat (Less sharp than george): amzn.to/37dx6Xn
(Links may be affiliate links, I will get a small commission if you choose to purchase from them, and it won't cost you a penny extra!)
excellent video
Very helpful, big thanks!!!
You're very welcome! glad it was helpful!
Changed the rear diff fluid on my 83 240d manual and the road noise difference from the rear end was amazing. The fluid was changed 6 or 7 years ago and it was time for another fluid change. I refilled the diff with 75w-90 Mobil 1 synthetic and the difference was definitely worthwhile.
I've heard great things about the 75w90 mobil 1, I'm thinking I'll pick some up for my next change
Mercedes in w115 w123 w114 w110 w108 w116 etc. Recommends only SAE 90 for the differential.. Using sunyhetic 75W90 for exampe, May cause problem (wear) to tha metal parts... These cars are old and need plain type of oil..
@@ΣωτηρηςΜανno reason to not use synthetic. Cars are old but some things have evolved GREATLY. Oil quality is one of them. Synthetic is simply far superior quality
Looks like you might need to consider new boots on your axle shafts
I'm literally preparing the tools and stuff to make a video on this soon! 😃
@@trythistv This is not a fun job, i’ll give you the tip 😅
@@MMWA-DAVE oh I figure its a wonderful joy, and grows exponentially as well, because "while I'm in there" I might as well do wheel bearings and brakes and shocks and I should put on the camber kit so I can correct the rear alignment with the heavy duty springs, and the heavier swaybar for better handling and so on and so on lol
You have a lot of great videos I have come across. I too am a diesel 123 owner just trying to keep it going for many more years of service. Did you ever get around to those CV boots?
...no. Thanks for the reminder haha, I have the new boots, tool and everything, I keep getting into other projects on my car and those boots are back there the same as they were. I need to do that soon before I forget again!
@@trythistv I believe I saw a video once about boot replacement and it stated that they are filled with oil? I could be wrong but the boot itself is designed to contain/hold a set amount of oil held in by the clamps. Either way I would be interested in seeing that video when you do it. I am fixing an issue on my 82 300D with the B2 piston in the trans as well as a significant leak on the turbo drain tube.
so clear and cut the crap. thanks
Glad it helped you out!
Wunderbarr
Dear Trythistv,
Shouldn't one flush the differential before refilling? You mentioned there were small metal shavings in there.
Thank you,
Peter
I'm not sure how I missed the comments on this video, evidently I haven't been getting notified of all of them. Anyway, flushing wouldn't hurt, my thought process is fresh oil, and I'll change it again after some driving, the first change will get the bulk of the contaminants, the rest will come on the 2nd change.
@@trythistv nice, thank you for the reply!
Another great, helpful video. I have a 1979 240D. I imagine they're very similar. What type of oil is it you used again? And what is the approximate capacity? And what about changing the manual transmission fluid? I looked at mine and it looks very similar to the differential where it has two bolts 1/4 fill. What type of oil is to be used in the manual transmission 240D? 1/4 drain.
I used 80w90 GL-5 gear oil, any reasonable weight near that will work perfectly, just don't use 140 weight or something. 75-90 is an excellent option as well. Takes just a hair over a quart, buy 2 quarts to be safe though.
I used conventional oil, synthetic may be better, I will likely flush this oil out again after we've driven for a while since it was so nasty.
The 4 speed manual transmissions I've been told to use a much lighter oil or it'll be weird to shift and can wear stuff out fast if used in cold environment where those gears are spinning around fast in oil that doesn't want to flow.
Also, yes the drain/fill works the exact same way on the manual transmission, get the fill plug out, then pull the drain plug
Some have said atf, I have read that the service manual for the 82 240ds said 10w20 engine oil in the transmission, so I used mobil 1 10w20 when I swapped the 4 speed into my grey 300d, it shifts great and seems happy with that.
👍
I would have started with the wasp nest 😅😅
Maybe the wasps really like the smell of gear oil? Not really sure why I didn't remove that nest lol
The pinion shaft oil seal is leaking ,replace the seal first...
I should change the dif oil on my 83 300D. I don’t want to know the condition of the oil.
I was surprised that mine wasn't worse, it was nasty and smelled horrible, but it was still mostly oil-ish. I'm going to change it again after a while and see if the fresh oil flushes out any nasty gunk
No matter the oil,,, GL4 or GL 5 is the question...
You forgot about the front differential!
I sure wish my w123 had a front differential 😆