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  #1  
Old 08-16-2013, 09:13 AM
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Why use higher viscosity differential fluid?

I am going to be replacing the differential fluid on several of my cars using Mobil 1 75w90 synthetic. However, I've noticed that some instead opt for Mobil 1 75w140. What's the case to be made for the higher viscosity fluid? What are the advantages and disadvantages?

In this area I'm a "lube newb"....just want to benefit from others' experience.

Thanks.

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06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 155k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 15k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #2  
Old 08-16-2013, 09:43 AM
Doktor Bert's Avatar
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You will receive no less than 1,000 different opinions on this topic...

In general, heavier viscosity index (VI) lubricants, gear oils in this case, provide more protection for heavily loaded gearsets. I also think that the 75w140 may (possibly) be a little quieter.

In my 116.120 I used Mobil 1 75w140 in the 2.47:1 axle swap. It's a good lube and provides extended drain intervals...FWIW
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #3  
Old 08-16-2013, 09:52 AM
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Quote:
Originally Posted by Doktor Bert View Post
In general, heavier viscosity index (VI) lubricants, gear oils in this case, provide more protection for heavily loaded gearsets. I also think that the 75w140 may (possibly) be a little quieter.
This was my reasoning on going with a heavier VI oil in the 190's differential, to try to quiet its whining down. Helped a little bit...

Just what is the change interval on diff oil on these cars?
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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
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  #4  
Old 08-16-2013, 09:56 AM
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I'm not aware of any official MB interval. FWIW Kent Bergsma recommends every 60-80k or five years, whichever comes first.
__________________
06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 155k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 15k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #5  
Old 08-16-2013, 09:57 AM
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Quote:
Originally Posted by JamesDean View Post
This was my reasoning on going with a heavier VI oil in the 190's differential, to try to quiet its whining down. Helped a little bit...
So no hesitation in deviating from MB recommendation?
__________________
06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 155k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 15k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #6  
Old 08-16-2013, 09:59 AM
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Hmm I either read somewhere or jinned up 100k intervals..

I also read that when you change your diff oil it can bring out the whining noises...Not sure if thats just shop legend or anything like that...
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #7  
Old 08-16-2013, 09:59 AM
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Quote:
Originally Posted by JamesDean View Post
Just what is the change interval on diff oil on these cars?
I'm not sure of the MBZ spec, but I change diff lubes at 50,000 miles...
__________________
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #8  
Old 08-16-2013, 10:00 AM
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Quote:
Originally Posted by JamesDean View Post
Hmm I either read somewhere or jinned up 100k intervals..

I also read that when you change your diff oil it can bring out the whining noises...Not sure if thats just shop legend or anything like that...
I doubt it. We had a customer once did a DIY service and put ATF in the diff of a 115 MBZ and drove it that way for years before anyone discovered it....never made noise.
__________________
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #9  
Old 08-16-2013, 10:02 AM
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Quote:
Originally Posted by Doktor Bert View Post
I doubt it. We had a customer once did a DIY service and put ATF in the diff of a 115 MBZ and drove it that way for years before anyone discovered it....never made noise.
I doubt it too. Seemed like nothing more than urban legend.

I've got a thread around here somewhere with the maintenance sheets from MB..

Aha

Maintenance System Sheet
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #10  
Old 08-16-2013, 10:08 AM
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Location: Barrington, RI
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Quote:
Originally Posted by JamesDean View Post
I doubt it too. Seemed like nothing more than urban legend.

I've got a thread around here somewhere with the maintenance sheets from MB..

Aha

Maintenance System Sheet
Links don't work for me.
__________________
06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 155k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 15k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #11  
Old 08-16-2013, 10:09 AM
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Quote:
Originally Posted by shertex View Post
Links don't work for me.
Yeah looks like the hosting site I used deleted them! I'll fix em and put a link in a sec here
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #12  
Old 08-16-2013, 10:09 AM
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Location: Barrington, RI
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My 92 was first done at 150k....am doing again at 245k. 91 at 108k and 90 at 95k have never been done AFAIK.
__________________
06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 155k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 15k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #13  
Old 08-16-2013, 10:26 AM
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Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,692
I located the maintenance sheets....I don't see an interval for differential fluid.
__________________
06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 155k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 15k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #14  
Old 08-16-2013, 10:27 AM
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Location: Barrington, RI
Posts: 5,692
I was also wondering how much additional fluid I might be able to get out with a fluid extractor.
__________________
06 E320 CDI "Benson", Platinum Blue, 181k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 155k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 133k mi, wastegate conversion

19 Honda CR-V EX 15k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
Reply With Quote
  #15  
Old 08-16-2013, 12:41 PM
Doktor Bert's Avatar
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Join Date: Jan 2005
Location: Palm Springs, CA.
Posts: 2,670
I change brake fluid twice a year in all our cars, except the 116 which has DOT 5 silicone (which I never change), oil and filter every 6,000, service the 722.120 every 40,000, change the ATF in my 2001 Mustang's Tremec 3650 5 Speed every 20,000 and diff lube at 40,000 to 50,000, regardless of any MBZ, BMW or Ford service suggestions....

__________________
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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