Ron3rd
Upland, CA USA
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As I mentioned in my other thread, I'm getting ready to change the diff lube in by 2016 Ram 2500 and would like some recommendation on gear lube.
I was looking at Mobil 1 Synthetic that meets the Ram GL-5 spec but notice it comes in 75W-90, not 75W-85 as recommended in the manual. Is this lube OK to use?
Just curious what others are using.
Also, according to the manual I do not need a friction modifier.
Update: Actually, my manual says to use 75W-85 in one section and 75W-90 in another section
I'm 2WD so I only need to do the rear diff.
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ScottG
Bothell Wa.
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Yes 75-90.
No friction modifier (your diff doesn't have a clutch)
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Ron3rd
Upland, CA USA
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Thanks Scott
What's weird is one section of my manual says to use 75W-85 and 75W-90 in another section.
Mobil 1 Synthetic OK? That's what I used in my last truck.
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Vette Racer
Oklahoma
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I have a 3500 pulling heavy so I run 75/140 severe duty. There is not much difference in the weights you mention, go with either.
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ScottG
Bothell Wa.
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I think you may also find it says to use 75/140 someplace. If you tow heavy in the heat it's a good choice.
I often tow in the desert and use it year round.
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Learjet
Louisiana
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that is what I used Mobil 1 75w-90...no problem
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Learjet
Louisiana
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ScottG wrote:I think you may also find it says to use 75/140 someplace. If you tow heavy in the heat it's a good choice.
I often tow in the desert and use it year round.
That was pre AAM axle...for AAM use what the manual says or 75w-90... at the most 75w-110...I'm sure someone will chime in about Amzoil soon ![[emoticon]](https://forums.goodsamclub.com/sharedcontent/cfb/images/smile.gif "smile")
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mowermech
Billings, MT
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I wonder if there aren't "IF/THEN" statements in your manual.
Such as:
IF the ambient temperature is this, THEN use that lubricant.
or
IF you are towing heavy loads in high heat, THEN you should use this lubricant.
or
IF you do not have a limited slip differential, THEN you do not need a friction modifier.
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Ron3rd
Upland, CA USA
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ScottG wrote:I think you may also find it says to use 75/140 someplace. If you tow heavy in the heat it's a good choice.
I often tow in the desert and use it year round.
Yeah, they call for that weight in the 4500/5500 trucks.
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Ron3rd
Upland, CA USA
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Learjet wrote:that is what I used Mobil 1 75w-90...no problem
I think that's what I'm going with too, readily available at Wal Mart.
Does anyone recall how many qts it holds? Could not find that info in the manual.
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