Probably not but I would not consider them to be Lifetime MTF's.Are these lubricants likely to cause issues in manual transmissions that don't ask for these lubricants?
For example, the two MTF's I go to (Fuchs Sintofluid 75w80 and Millers Oils TRX 7w5w80) are both rated GL-5. I use them in older gearboxes such as the R380 in the Defender.
Also, I can't see any advantage of these fluids over say Pennzoil Synchromesh or the Valvoline Synchromesh MTF'S when the spec is for a GL-4 at ~ 10cSt.
See post #20.