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Discussion Starter · #1 ·
i want to change the fluid in my tranny any suggestions and what does everyone think of amsoil.. so far I like it best in the motor oil category but the parts store doesnt know what i should run in the tranny as far as weight and type of amsoil... thanx for the help
 

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I have heard Amsoil is good just a little expensive. But any of the syntehtic oils are recommended.
 

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I run Royal purple which is similar to Amsoil. Both are good stuff

for the NV4500 you need 75W-90 castrol syntorq, but both amsoil and royal purple have compatible oils. The NV4500 is sensitive when it comes to fluid so I wouldn't run anything but 75W-90
 

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Discussion Starter · #4 ·
so amsoil 75w 90 synthetic... ill see if they have it thanx
 

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Not to hurt anyones feelings but amsiol is far better than royal purple test have proven it.
if you have a manual tranny 75w-90 if it is an auto you want the amsion ATF universal. Ask if you have questions.
 

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No feelings hurt. I would really like to see these results though before I buy amsoil
 

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Royal Purple uses a different chemistry than most. They are one of only a handful of marketers using Moly in their oil. Moly is a solid, specifically banned by Cummins, due to excessive valve train wear.

Moly (Molybdenum Disulfide) is a processed mineral that is similar in appearance to graphite. Moly has good lubricating properties when used either by itself (in dry power form or as an additive to oil or other lubricants). Particles of the Moly can come out of suspension and agglomerate. This can actually clog oil filters or oil lines and the rest normally settles in the bottom of the oil pan. This seems to be more likely when using extended drain intervals. The only test we ran on RP involved their 20W50 Racing oil versus our AMSOIL Series 2000 Synthetic 20W50 Racing Oil (TRO). We ran two 4 ball wear tests with different parameters, a spectrographic baseline, FTIR scan and volatility tests. The Royal Purple showed a significantly high volatility rate with a 12.51% boil off rate. This compares to TRO with a 4.47% volatility rating. Wear scars were also smaller with the TRO. For example the TRO left a .41mm scar and the RP oil left a .66mm scar. There was also a surprising difference in the viscosity index. The RP has a VI of 129 versus 155 for the TRO. The higher the VI, the better the viscosity stays in place at high temperatures.

This information was provided by AMSOIL Tech Department. They had an independent lab test Royal Purple against AMSOIL. The results are posted above. They have found Moly in Royal Purple. As stated above, this can have negative effects on your engine
 

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Thats why I use Exxon XD-3 15W-40... It meets and exceeds Cummins specs...

 
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