Performance and Accessories 2nd gen only Talk about Dodge/Cummins aftermarket products for second generation trucks here. Can include high-performance mods, or general accessories.

Recommend synth fluids

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Old 03-23-2004, 09:25 AM
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Recommend synth fluids

I am planning to change both the front and rear diff oil and the oil in my 6 speed trans. What do you recommend (brand, weight) for each? Redline?, Royal Purple? Amsoil? What has worked well for you? Thanks
Old 03-23-2004, 09:49 AM
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Royal Purple 85w90 in both differentials for me.
If you live where it doesn't get too cold and tow heavy use 75W140

I don't have a 6 speed, rather a 5 and use the only lube the factory recommends, Castrol Syntorx (not Syntex), which is also a synthetic.
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