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Hi Some additive are ok in basic stuff like engine's but using additives in auto boxes are really a no no, most additive's are friction reducers and you dont want that in a gearbox, it can cause the friction plates to slip and also most auto gearboxes have a lockup clutch in the torque convertor, you don't want this to slip either additives are also no good in gearboxes with LSD's in and I recommend just using descent oils, I use Castrol edge proffesional in mine and Genuine ZF oil in the gear box, Castrol Again in the diff cheers Joe