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Any fluid specified for an NV3500 should work in an NV3550. From reading the material on Redline's website, it appears that MTL (what they recommend for the NV3550) and MT90 are basically the same fluid except for viscosity. MTL is for applications that call for a thinner fluid, and MT90 is for applications that call for a slightly thicker fluid. They both meet API GL-3/GL-4 standards and are brass synchro friendly.
 
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