(Copper-alloy synchronizers here imply a Bronze or Brass metal machined alloy).Ī hypoid gear differential lube, once again, has to have a GL-5 rating with the proper EP additive because of it high loading. An MTF with a GL4-/GL-5 rating ALSO has an additional component called a "Friction Modifier" for the synchronizer assembly to insure proper meshing and spin-up forces. I dunno about that I won't run it in my Suburban's transfer care, only the OE GM "Blue" fluid since mine has "auto" mode and there are plenty of reports of those blowing up if you run something else, even though it allegedly is "compatible." The setups without "auto" mode (push-button lock, but no "auto" mode) are supposedly ok with non-GM OE fluid the issue is claimed to be with the clutch system in the ones that have "auto" capability.Ĭlick to expand.Your last sentence is confusing and I am not sure what it says.Īgain, We're discussing here a properly formulated and application specific MTF that has a GL-4/GL-5 rating which would be safe for copper-alloy synchronizer assemblies. That's the one with 225k miles on it (the other is a MTX Jetta TDI.)īTW one oddity - the MTL claims to be GM Auto-Trak II compatible. The Redline MTL mentioned up-thread is specifically a GL-4 fluid I run it in my Mazda as it meets manufacturer specifications. Both have zero evidence of synchronizer or differential trouble. Both specify GL-4 and both have run it since they were new, with myself being the only one who has ever changed said fluid since they came from the factory. I have two cars in my driveway right now that are FWD and thus have combined differential/MTX sumps. The issue isn't usually corrosion "per-se." It's the EP additives the way they work is by forming a film on the gear face through chemical bonding, which shears first under extreme load when the gear ends up in what's called a boundary condition (that is, the pressure is high enough that there is no film of oil between the two pieces.) That's good the metal is protected and is the point.Įxcept - if that bonding is stronger than the synchronizer material guess what happens.īTW its a royal biatch to rip a MTX apart and replace the synchronizers. Unless the manufacturer of the gearbox approves GL-5 lubricants (some of them get rather specific as to what's approved and what's not) you're playing with fire thinking that "higher number is better" and if a particular lube has both ratings on it that does not mean its safe for the synchros.
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