Engine/Transmission (1998.5 - 2002) Rear differential fluid

[Gary - K7GLD]

WAYNE - I thought it *was* the sulphur/phosporous in conventional EP lubes that caused erosion of brass?



Or to put it as a plain question, is Amsoil in the specified weight MT-1 rated, as required for use in our differentials? I'm gonna be looking for SOMETHING in the way of a good synthetic for my own differential, so far, leaning towards Mobil 1 - but Amsoil might just work for me too, if it fits the DC spec... .



Can you provide a ballpark price per quart for the Amsoil lube? Use Email if board rules prevent a reply here...



Thanks.

 

[amsoilman]

GARY,

Both the Amsoil series 2000 gear lubes 75W-90 and 75W-140 are API rated MT-1 lubes. EP additives are generally NOT recommended for equpment containing sensitive components, such as brass UNLESS the lube ALSO meets MT-1 Requirements.



I can not tell you the price here, but will E-mail you.







Wayne

amsoilman

 

[Texas Diesel]

Originally posted by Pit Bull





Texas Diesel, I would love to use Mobil 1 gear lube (very easy to find) but I noticed it was not MT-1 rated. I was lead to believe that the MT-1 rating was very important. What are your thoughts on that? How long have you run the Mobil 1 lube and have you had any seal failures?

I had a pinon seal seep at 36k and stopped at 40k. dont have a clue, dry as a bone now at 44k. Just bought 8 qts today of Mobil 1 for $6. 99 a quart at Autozone.



Dont have a clue about MT-1, send any info you have on it as my google search turned up nothing but I am very interested.



Did you read this thread: https://www.turbodieselregister.com/...+warranty+mobil

? Read the post by gmorrison.

 

[Pit Bull]

Originally posted by Texas Diesel







Dont have a clue about MT-1, send any info you have on it as my google search turned up nothing but I am very interested.



Did you read this thread: https://www.turbodieselregister.com/...+warranty+mobil

? Read the post by gmorrison.

I don't have a clue either about MT-1, only read about it in a article in the TDR, said that if you used a lube in your diff. that was not API cert. for MT-1 your seals would leak I've already had one leak on the factory fill and did not want to put the wrong stuff in and make it leak again. Thanks for the reply.

 

[Gary - K7GLD]

Thanks again Wayne - I'm VERY interested - more later...

 

[mimprevento]

Mopar

Why not just use the Mopar fluid from the dealer- they cannot claim warranty issues- it is pricey at 26. 00 per unit ( quart I think) but it is what they suggest and it is great stuff- I don't think you can have overkill on a lube- I run light all the time but like having the extra protection.

 

[Texas Diesel]

Originally posted by Pit Bull





I don't have a clue either about MT-1, only read about it in a article in the TDR, said that if you used a lube in your diff. that was not API cert. for MT-1 your seals would leak

Found this:



The requirements of many equipment builders exceed those of the API specifications. As a result, SAE and ASTM have updated GL categories to reflect present and future needs. This action has promoted the development of gear lubricant categories API MT-1 and proposed PG-2, which are designed to meet the performance requirements of North American heavy-duty or commercial equipment.



API MT-1 designates oils for heavy-duty truck and bus manual transmissions. Its focus is on improved high-temperature cleanliness and stability, oxidation and anti wear control, and compatibility with oil seals and copper alloys. PG-2 is for heavy-duty truck and bus final drive axles using spiral bevel and hypoid gears. It also includes seal compatibility.



http://www.oilmedic.com/additives.html#GL



Now what



http://www.hgnr.com/Products/Mobil1/Mobil1_page.html

 

[Pit Bull]

I'm going to keep looking for a MT-1 rated synthetic that is available locally, wish me luck

 

[Texas Diesel]

Let me know what you find. I suspect that they will all uprate their products to MT-1, it will probably be in the store the day after I put the Mobil 1 in the truck



I wish I knew more about "seal compatability", I put Mobil 1 in my wifes truck that has 190,000 and no leaks. Perhaps there is new seal material coming out. The 2001 service manual requires GL-5 and MIL-L-2105-C only.



There was a site I found that listed all the oils that meet GL-5 and MT-1, there were quite a few that did. Amsoil was one of them that did, if you want I'll try to find it again.

 

[Paulsdodge]

Differential Fluid

Ok guy,

Thanks for the advice. I failed to mention this, and now that I read the post I know I should have. I use my truck as a daily commuter, and very rarely pull a 16' open trailer with a 4100 John Deere tractor. Rarely does this truck ever see over 5,000 lb trailer weight. So from the advice given I'll assume I'll be okay using the standard gear lube. However, won't this affect my warranty? The person I talked to at the dealership said for the Dana 80 this is the only fluid DC recommends. I have a 2500 HO with the six speed. The rear end on this one is the Dana 80. The 2500 that has standard output is the Dana 70 which according to my service manula uses standard 80w-90 gear lube. What do you guys think??? Hey and one more thing, you guys really help me out THANKS

 

[Texas Diesel]

Per the 14 pound service manual (2001) you need to use SAE 80W-90, MIL-L-2105C, gear lubricant. Heavy duty or trailer towing requires SAE 75W-140 Synthetic. Dont forget the friction modifier. Buy it from Dodge, it's the best. Save the receipt and write the mileage on it so you can prove you added the modifier.

Limited slip axles only.

 

[redram]

Originally posted by Pit Bull

Make sure whatever brand you choose is MT-1 rated so you don't have any seal problems. It's funny how many are not MT-1 rated.

MT-1 is a rating for Manual Transmissions - should not have any great effect on using a non MT-1 rated oil as long as it meets API GL-5 rating.



Royal Purple MaxGear is available in 75W140, as well as 75W90 or 85W140. Available from a bunch of places, including mailorder through Jegs.com. It already contains the proper friction modifier for the limited slip / posi units and is a fully synthetic product.



Remember to do a couple slow figure eights if you have a posi when you change the rear diff fluid.

 

[Pit Bull]

Originally posted by redram





MT-1 is a rating for Manual Transmissions - should not have any great effect on using a non MT-1 rated oil as long as it meets API GL-5 rating.

That is not what it said in the TDR.

 

[amsoilman]

Originally posted by redram





MT-1 is a rating for Manual Transmissions - should not have any great effect on using a non MT-1 rated oil as long as it meets API GL-5 rating.

I don't think so! MT-1 refers to the ability of a lubricant containing (EP) Extreme Pressure additives to function in elevated temperature applications without corrosive by-products. It is an API rating, and is for many types of gear boxes, not just Manual Transmissions.





Wayne

amsoilman

 

[redram]

Here is a link to Pennzoil's description of a gear oil.

http://www.pennzoil.com/penn/products/car_truck/pdfs/gearoil/Gearplus80W140.pdf

Yes, many hypoid gear oil can carry the API MT-1 rating but this is an API spec relating not to differentials, but to heavy duty over the road manual transmissions. My comment is that this is not a requirement for the differential fluid rating on our Dodge Dana 70 or Dana 80 type differentials.

It will not hurt to have the additional API MT-1 rating, but is not required per the application.



Here is a quote from an Exxon site regarding this specification. Again, it does not reference "differentials" http://www.exxon.com/exxon_lubes/tigerbytes/documents/productdatasheets/pds154.htm



"Meets API MT-1 —Compared with an API GL-5 lubricant, an API MT-1 lubricant provides superior protection against thermal degradation, component wear, and oil seal deterioration. GEAR OIL GX meets API MT-1 requirements and is therefore suitable for non-synchronized manual transmissions in buses and heavy-duty trucks. "



Gee, here's another oil manufacturer Sunoco quoting in their gear oil product description, http://www.sunocoinc.com/market/gearoils.htm "Meets API MT-1 for use in non synchronized manual transmissions. "



I read the article in the TDR and although it was informative, it was not entirely accurate.



Let's go to the source, www.api.org.

http://www.api-ec.api.org/filelibrary/glchart.pdf



If that doesn't work, go to the api site (www.api.org) and do a search for MT-1 if that link doesn't work.



Guys, the MT-1 spec is great but it really applies to non-synchronised manual transmissions in buses and heavy duty applications.



Hope you find this information useful.

 

[Pit Bull]

Thanks Redram for all your research I guess I can buy the Mobil 1 lube now and add the snake oil lsd modifier from dodge.

 

[Lordsman]

Royal Purple

I just changed mine with Royal Purple Max-Gear 75w-90. It does not say MT-1 rated but it does say "meets MIL-L-210E" requirements. I hope this stuff is ok. It "only" cost 8. 99/qt.

What do you Royal Purple users think? Are my seals safe?

 

[Texas Diesel]

DC or DANA do not require MT-1, GL-5 is it.



After reading the above mentioned links it is my opinion that MT-1 is exactly that, Manual Transmission - 1. We dont have yellow metal in the rear axles and MT-1 neither helps or hurts the axles.

I dont understand clearly the reference to seal life but obviously the rating is intended for "Non-synchronized manual transmissions" only.

 

[redram]

Re: Royal Purple

Originally posted by Lordsman

I just changed mine with Royal Purple Max-Gear 75w-90. It does not say MT-1 rated but it does say "meets MIL-L-210E" requirements. I hope this stuff is ok. It "only" cost 8. 99/qt.

What do you Royal Purple users think? Are my seals safe?

You'll love the RP MaxGear 75W90. It does meet the new MT-1 rating but the labelling has not been updated.



I have used the MaxGear in both my NV4500 for 110K miles and my Dana 80 for 130K miles. Truck has 142K on it. Original axle seals and transmission seal. It is friendly to seal materials as well on the bronze synchronizers in the transmission.



By the way, this product has been or is in use in all forms of racing, from Ferrari's running at Daytona and Sebring, to Trans Am cars, to Bugatti's at leMans to Lamborghini offshore race boats as well as recommended by Hewland in the UK and Italy.

Also over the road trucks and off highway equipment)

 

[Lordsman]

Thanks Redram.