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1998 Mercedes-Benz S500
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Discussion Starter #1
Hi To ALL!!! I'm going to change the gear oil in my rear differential and I have a 1998 Mercedes Benz S500. Is this the correct oil to use:

1. Mobil 1 75W-90
2. Red Line 75W-90
 

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1993 190E 2.6, 1990 300SEL, 1992 300SE, 1992 400E, 1987 190E 2.6 murdered by my brother.
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Your manual probably specs for MB hypoid gear oil 85W90. Those you have listed are fine. They just flow better at lower temps so maybe you will get a little better gas mileage and less hesitation when its cold. Redline and Mobil 1 are both synthetic and will work fine for you. Both are rated GL5 I think so... Enjoy.
 

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'04 G55 '80 280GE '99 S420 '98 E320 2011 E350 2016 GLA250
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1998 Mercedes-Benz S500
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Discussion Starter #4
Runninrebel211 and G-AMG-Thank you soo much! So which one you recommended : Mobil1 75w90, Red Line 75W90, Valvoline 75w90 or the original one-Hypoid gear oil 85W90
 

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1997 E320, 1997 S320
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whichever 75w90 is cheaper, all of them are gl-5 so take your pick. mobil1 75w90 even has the mb star logo on the bottle and it's about $7-8 at any autoparts store.
i haven't changed the differential fluid in my s320 yet, but i will probably use a mix of mobil1 75w90 and 75w140 to make a final 75w110. i just like to mix things up:D. i put 75w140 in the e320 and hasn't affected mpg's at all.
 

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1998 Mercedes-Benz S500
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Discussion Starter #6
Hi To ALL!!! DONE, the choice is made and the winner is: RED LINE 75W90 :D
In Saturday I will try to change!!!:D Wish me luck!:D:thumbsup:
 

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good choice. make sure though you unscrew the fill plug first, then the drain plug, just to make sure the fill plug will come out. you don't want to drain all the old fluid out and not be able to fill it with fresh fluid:D
 

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1998 Mercedes-Benz S500
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Discussion Starter #9
good choice. make sure though you unscrew the fill plug first, then the drain plug, just to make sure the fill plug will come out. you don't want to drain all the old fluid out and not be able to fill it with fresh fluid:D
:D:thumbsup: will do :thumbsup:
 

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1993 190E 2.6, 1990 300SEL, 1992 300SE, 1992 400E, 1987 190E 2.6 murdered by my brother.
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So how is the Redline gear oil working out for you so far? I ve been away so havent been able to check back with ya. The price isnt too bad. I put Lucas 80W90 in my diff and man is it dragging....very sluggish operation in cold weather. Works fine when its warm but those cold mornings really drag. I am thinking about switching it out tomorrow. Got 2 bottles of Mobil 1 75W90 already.
 

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98' CL500, 96' S600 coupe & the newly acquired 95' SL600
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I have a really good question.

Exactly where do you change this particular fluid!?!?!!? Unless I missed it, I didn't see a DIY for this situation.:rolleyes:
 

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98' CL500, 96' S600 coupe & the newly acquired 95' SL600
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Nevermind folx. I found a really good thread on Rear Diff Fluid.
 

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1998 Mercedes-Benz S500
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Discussion Starter #14 (Edited)

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98' CL500, 96' S600 coupe & the newly acquired 95' SL600
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Good Pics.....

I decided I'm going with Lubro Moly Rear Diff Oil. I like their products.
 
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